Question

Verify that( a+b)+c=a+(b+c) by taking a=-1,b=-2/3,c=-3/4

Answer 1

(a+b)+c=[-1+(-2/3)]+(-3/4)

=[-1-2/3]-3/4

=[-12/12-8/12]-9/12

=-20/12-9/12

=-29/12

a+(b+c)=-1+[-2/3+(-3/4)]

=-1+[-2/3-3/4]

=-12/12+[-8/12-9/12]

=-12/12+(-17/12)

=-12/12-17/12

=-29/12

(a+b)+c=a+(b+c)=-29/12

Hence, verified.

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Answer 2

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