72×2.09-1.8×73.6 简便运算

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72×2.09-1.8×73.6简便运算72×2.09-1.8×73.6简便运算72×2.09-1.8×73.6简便运算72*2.09-1.8*73.6=1.8*40*2.09-1.8*73.6=1.

72×2.09-1.8×73.6 简便运算
72×2.09-1.8×73.6 简便运算

72×2.09-1.8×73.6 简便运算
72*2.09-1.8*73.6
=1.8*40*2.09-1.8*73.6
=1.8*(40*2.09-73.6)
=1.8*(83.6-73.6)
=1.8*10
=18

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