Question

Verify that a +(b+c)=(a+b)+c by taking a=-4/5,b=7/8,c=3/4​

Answer 1

Step-by-step explanation:

4/5+(7/8+3/4)=(4/5+7/8)+3/4

4/5+(7+6/8)=(32+35/49)+3/4

4/5+13/8=67/40+3/4

32+65/40=67+30/40

97/40=97/40

Verified

Answer 2

$lhs = \\ \frac{4}{5} + ( \frac{7}{8} + \frac{3}{4}) \\ \frac{4}{5} + ( \frac{7}{8} + \frac{6}{8} ) \\ \frac{4}{5} + \frac{13}{8} \\ \frac{97}{8}$

$rhs = \\ (\frac{4}{5} + \frac{7}{8} ) + \frac{3}{4} \\ ( \frac{32}{40} + \frac{35}{40} ) + \frac{3}{4} \\ \frac{67}{40} + \frac{3}{4} \\ \frac{67}{40} + \frac{30}{40} \\ \frac{97}{40}$

THEREFORE

LHS=RHS