Вычесли удобным способом:
1)(36×21):12 3)(5×6×78):3
2)(40×420):60 4)(45×63):81
1)(36×21):12 3)(5×6×78):3
2)(40×420):60 4)(45×63):81
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2)(420/60)*40=7*40=280
3)(5x6)/3*78=30/3*78=10*78=780
4)(45/9)*(63/9)=5*7=35
Примечание:81=9*9