Question

(3/4+1/20)×1/2 ,(7/12-1/3)×16/19

Answer 1

1)(3/4+1/20)×1/2 =(15/20+1/20)*1/2=16/20*1/2=8/20=2/5; /// ,2)(7/12-1/3)×16/19=(7/12-4/12)*16/19=1/4*16/19=4/19