CBSE > Class 09 > Mathematics | CBSE Board | Homework Help

Let x = 0.666... {equation 1} Multiply both sides by 10. 10 × x = 10 × 0.6666... Therefore, 10x=6.666... {equation 2} Subtract equation 1 from equation 2. 10x-x = 6.666...- 0.666... 9x = 6 x = 6/9 x = 2/3 Ans.

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Ramesh Sawant 1 year, 2 months ago

X =0.6 bar 10×=6.6 bar Subtract both 10x -×=6.6-0.6 9×=6 ×=6/9 ×=2/3

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Prove that (a+b+c)^3 -a^3-b^3-c^3 =3(a+b) (b+c) (c+a)

Posted by Chinmayee Kumari Sahu 1 year, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Aanvi Saxena 1 year, 2 months ago

=>(a+b+c) 3 =(a 3 +3a 2 b+3ab 2 +b 3 )+3(a 2 +2ab+b 2 )c+3(a+b)c 2 +c 3 =>(a+b+c) 3 =a 3 +b 3 +c 3 +3a 2 b+3a 2 c+3ab 2 +3b 2 c+3ac 2 +3bc 2 +6abc =>(a+b+c) 3 =a 3 +b 3 +c 3 +3a 2 b+3a 2 c+3ab 2 +3b 2 c+3ac 2 +3bc 2 +3abc+3abc =>(a+b+c) 3 =a 3 +b 3 +c 3 +3a(ab+ac+b 2 +bc)+3c(ab+ac+b 2 +bc) =>(a+b+c) 3 =a 3 +b 3 +c 3 +3(a+c)(ab+ac+b 2 +bc) =>(a+b+c) 3 =a 3 +b 3 +c 3 +3(a+c)[a(b+c)+b(b+c)] =>(a+b+c) 3 =a 3 +b 3 +c 3 +3(a+c)(b+c)(a+b) =>(a+b+c) 3 −a 3 −b 3 −c 3 =3(a+c)(b+c)(a+b)

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Represent 0.7 bar in the form of p/q

Posted by Naman Kumar 1 year, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Atharva Shukla 1 year, 2 months ago

Let x = 0.7 bar Therefore, 10x = 7.7 bar 10x = 7+x 10x - x = 7 9x = 7 x = 7/9

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Ex 4.3

Posted by Sumit Mandal 1 year, 2 months ago

CBSE > Class 09 > Mathematics

2 answers

Yashika Tyagi 1 year, 2 months ago

Which question ?

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Mansvi Jhajharia 1 year, 2 months ago

Of which chapter?

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Xcube - 3x square-9x-5

Posted by Moksh Bhardwaj 1 year, 2 months ago

CBSE > Class 09 > Mathematics

0 answers

ANSWER

Express 2x+1=x-3=-4

Posted by Himanshu Saini 1 year, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Sonam Sonam 1 year, 2 months ago

2/3

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(-9/14) + (-4/3)

Posted by Himanshi Sharma 1 year, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Gagan Goyal 1 year, 2 months ago

83/62

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How to represent 3+√2.6 on the number line

Posted by Kartiki Ghodke 1 year, 2 months ago

CBSE > Class 09 > Mathematics

0 answers

ANSWER

What is the sum of X2+ab-(45+3)

Posted by Kartiki Ghodke 1 year, 2 months ago

CBSE > Class 09 > Mathematics

0 answers

ANSWER

2 + (-1) + [2×(-1)]+(-1)×(-1)×(-1)

Posted by Jeet Patel 1 year, 2 months ago

CBSE > Class 09 > Mathematics

2 answers

Ritika Poddar 1 year, 2 months ago

First open the brackets then solve it☺

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Ritika Poddar 1 year, 2 months ago

=2-1-2-1 = -2

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Express 0.1254 bar in the form of p upon 1

Posted by Benazir Sabha 1 year, 2 months ago

CBSE > Class 09 > Mathematics

2 answers

Ritika Poddar 1 year, 2 months ago

Let x =0.12541254..... (1) eqn. (1) ×10000=10000x =1254.1254....(2) Subtracting eqn.(1) from eqn.(2) ->10000x-x = 1254.1254...- 0.1254... 9999x = 1254 x = 1254/9999 = 139/1111 Thank you 🤗

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Simran Thapa 1 year, 2 months ago

1254 upon 10000

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Simplyfy 7root3minus5root2upon root48plus root18

Posted by Himani Singh 1 year, 2 months ago

CBSE > Class 09 > Mathematics

0 answers

ANSWER

Write the abscissa and ordinate of the following points. (A)-(2,-7) (B)-(0,3/2) (C)-(6,4) (D)-(-4,-3) (E)-(-6,0) (F)-(-3,2)

Posted by Aditya Kumar 1 year, 2 months ago

CBSE > Class 09 > Mathematics

0 answers

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Decimal representation of a rational number cannot be

Posted by Manaswini Mantri 1 year, 2 months ago

CBSE > Class 09 > Mathematics

2 answers

Gagan Goyal 1 year, 2 months ago

Irrational no

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Yogakarthikeyan K 1 year, 2 months ago

In numbers

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Abscissa of all the points on the x-axis is

Posted by Manaswini Mantri 1 year, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Mohit Dalal 1 year, 2 months ago

What

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3 cube root 16 × cube root 4

Posted by Avika Sharma 1 year, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Gagan Goyal 1 year, 2 months ago

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2.1 1

Posted by Tarun46112 Tarun46112 1 year, 2 months ago

CBSE > Class 09 > Mathematics

2 answers

Mayank Jain 1 year, 2 months ago

It's answer is 2

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Omkar Bochare 1 year, 2 months ago

2 .11

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25a²+35a+12

Posted by Y Yesudaya 1 year, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Yashika Tyagi 1 year, 2 months ago

(5a+3 )(5a+4)

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An exterior angle of a triangle is 180 and the interior opposite angles are in the ratio 1:3, measure of interior opposite angles are

Posted by Shikha Kumari 1 year, 2 months ago

CBSE > Class 09 > Mathematics

2 answers

Balaji Veeraboine 1 year, 2 months ago

Hiiii

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Amrita Kumari 1 year, 2 months ago

Let 1 and 3 be 1x and 3x We know that exterior angle if a triangle is equal to its opposite interior angles So that, 1x+3xis equal to 180 4xis equal to 180 now X is equal to 180 divide by 4 and value of x is 45 Now we shall put value of x 1x is equal to 1 multiply 45 equal to 45 3x is equal to 3 multiply by 45 equal to 135. Now your question is solve.

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Factorise x3+6x2+11x+6

Posted by Srinisha Nisha 1 year, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Kartik Jaiswal 1 year, 2 months ago

5e5s5dd5

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Which one of the following is not a polynomial

Posted by , Mr. Sai Prasath. S ' 07 1 year, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Harshdeep Singh 1 year, 2 months ago

2x+3y

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Find a rational number between 1/7 and 2/7

Posted by Mamatha Suresh 1 year, 2 months ago

CBSE > Class 09 > Mathematics

2 answers

Yashika Tyagi 1 year, 2 months ago

3/4

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Vasanth Reddy 1 year, 2 months ago

1/7= 0.142857 bar

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Find the area of a triangle two sides of which are 18 cm 10 cm and the perimeter is 42 CM

Posted by Nilesh Singh Tanwar 1 year, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Omsri Dutta 1 year, 2 months ago

Another side = 42-(18+10)=42-28=14 S=42/2=21 Area = root over[ s(s-a)(s-a)(s-a) =root over[ 21(21-18)(21-10)(21-14) = root over[ 21×3×11×7] =root over[3×7×11×7×3] =21root11 cm²

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Describe the position of a table lamp on your study table to another person

Posted by Bhavya Kanwar 1 year, 2 months ago

CBSE > Class 09 > Mathematics