Вариант I:
1. 1) 36:2/9 = 36*9/2 = 18*9 = 162
2) 40:4/5 = 40*5/4 = 10*5 = 50
2. 1) 90*2/9 = 10*2 = 20
2) 400*4/5 = 80*4 = 320
Вариант II:
1. 1) 24:3/4 = 24*4/3 = 8*4 = 32
2) 42:6/7 = 42*7/6 = 7*7 = 49
2. 1) 240*3/4 = 60*3 = 180
2) 4200*6/7 = 600*6 = 3600