Question

Fill in the missing operations and numbers that makes the equation true

a) 12.3 + ( 5 + 7 ) = 5 + 7 ........... 12.3

b) ................. ( 1/2 + 2/3 ) = 5/7( 2/3 + 1/2 )

Answer 1

a) +

b) $\frac{5} {7}$