图望采纳
12.5乘以小括号7.4乘以9
12.5*(7.4*9)
=12.5*(7.4*10)-7.4
=12.5*74-7.4
=925-7.4
=917.6
12.5X(7.4X9)
=12.5X8X7.4+12.5X1X7.4
=100X7.4+12.5X8-12.5X0.6
=740+100-12.5X2X0.3
=840-7.5
=832.5
12.5*7.4*9＝12.5*（8-0.6）*9-0.6*12.5*9=900-5.4*12.5＝900-67.5=832.5
图
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