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Simplify: 1311×-145+1311×-75+-1311×345 - Mathematics

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Question

Simplify:

`13/11 xx (-14)/5 + 13/11 xx (-7)/5 + (-13)/11 xx 34/5`

Sum

Solution

Given, `13/11 xx (-14)/5 + 13/11 xx (-7)/5 + (-13)/11 xx 34/5`

= `(13 xx (-14))/(11 xx 5) + (13 xx (-7))/(11 xx 5) + ((-13) xx 34)/(11 xx 5)`

= `(-182)/55 + ((-91))/55 + ((-442))/55`

= `(-182 - 91 - 442)/55` ......[Taking LCM]

= `(-715)/55`

= –13

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Chapter 8: Rationals Numbers - Exercise [Page 249]

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NCERT Exemplar Mathematics [English] Class 7
Chapter 8 Rationals Numbers
Exercise | Q 81. (i) | Page 249

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