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Evaluate: (-137×-3539)-(-745×914) - Mathematics

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Question

Evaluate:

`((-13)/7 xx (- 35)/39) - ((-7)/45 xx (9)/14)`

Sum

Solution

`((-13)/7 xx (- 35)/39) - ((-7)/45 xx (9)/14)`


`=> (-13 xx (-35))/(7 xx 39) - (- 7 xx 9)/(45 xx 14)`

 

`=> (cancel(-13)^(-1) xx cancel(-35)^-5)/(cancel(7)_1 xx cancel(39)_3) - (- cancel(7)^1 xx cancel(9)^1)/(cancel(45)_5 xx cancel(14)_2)`


`=> (-1 xx (-5))/(1 xx 3) + (1 xx 1)/(5 xx 2)`


`=> (5)/3 + 1/10`

∵ L.C.M. of 3 and 10 = 30

`=> (5 xx 10)/(3 xx 10) + (1 xx 3)/(10 xx 3)`


`=> (50 + 3)/30 = (53)/30 = 1 23/30`

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Concept for Problem Solving Using Operations on Rational Numbers
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Chapter 2: Rational Numbers - Exercise 2 (E)

APPEARS IN

Selina Concise Mathematics [English] Class 7 ICSE
Chapter 2 Rational Numbers
Exercise 2 (E) | Q 8.4
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