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Ответ:

1-тапсырма

a)30:100*10=3

125:100*10=12,5

310:100*10=31

b)16:100*50=8

72:100*50=36

400:100*50=200

c)28:100*25=7

68:100*25=17

360:100*25=90

2-тапсырма

a)12*100:3=400

21*100:3=700

36*100:3=1200

b)0,4*100:10=4

9,25*100:10=92,5

28*100:10=280

c)42*100:60=70

84*100:60=140

114*100:60=190