212x37十172x56用简便方法计算

2024-11-28 15:29:44
推荐回答(2个)
回答1:

212x37十172x56
=(172+40)x37十172x56
=172×(37+56)+40×37
=172×(100-7)+1480
=17200-172×7+1480
=17200-1204+1480
=17200+276
=17476

回答2:

212X37+172X56
=212X(40-3)+172X(60-4)
=8480-636+10320-688
=18800-1324
=17476