Question

(2/15+7/12)*30/40-2:2 2/1*5/32

Answer 1

в 1 примере -0.46
Во 2 примере 0.31

Answer 2

1. 2/15+7/12=(8+35)/60=43/60

43/60*30/40=43/80

2:2 2/1=2/1:4/1=2/1*1/4=1/2

1/2*5/32=5/64

43/80-5/64=(344-50)/640=294/640=147/320