If 4-7-2-5-4-5-1-7-5-7-2m- Find m-

4/7+2/5+ 4/5+1/7+ 5/7 =20+14 28+5 2535 = 1435 = 25 ...

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Byju's Answer

Standard VII

Mathematics

Addition of Rational Numbers

If 4/7+2/5+...

Question

If $\frac{4}{7} + \frac{2}{5} + \frac{- 4}{5} + \frac{1}{7} + \frac{- 5}{7} = \frac{- 2}{m}$ . Find $m$ .

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Solution

$\frac{4}{7} + \frac{2}{5} + \frac{- 4}{5} + \frac{1}{7} + \frac{- 5}{7}$

$= \frac{20 + 14 - 28 + 5 - 25}{35}$

$= \frac{- 14}{35}$

$= \frac{- 2}{5}$

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Solve the following

1. -5(a-3)-2(a+5)=7-9a

2. m/7+1/3= m/6+5/4

3. 2a/3-4/5=-3/4+1

Find the sum of the following polynomials and write the degree of the sum so obtained

(i) 2x³ $-$ 7x² + 3x + 4 ; 2x³ $-$ 3x² + 4x + 1
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(iii) x⁴ + 5x³ + 7x ; 4x³ $-$ 3x² + 5
(iv) y² + 2y $-$ 5 ; y³ + 2y² + 3y + 4 ; y³ + 7y $-$ 2
(v) 5m² + 3m + 8 ; m³ $-$ 6m² + 4m ; m³ $-$ m² $-$ m + 5