Решите 4-(4 21/40-5,25):1 9/20=

Question

Решите
4-(4 21/40-5,25):1 9/20=

Answer 1

1) 4 21/40-5,25=181/40-5 25/100=181/40-525/100=905/200-1050/200=-145/200=-29/40
2) -29/40:1 9/20=-29/40:29/20=-29/40×20/29=-1/2
3) 4-(-1/2)=4/1+1/2=8/2+1/2=9/2