8.4*7.2+0.84*28简便计算(递等式)

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8.4*7.2+0.84*28简便计算(递等式)
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8.4*7.2+0.84*28简便计算(递等式)
8.4*7.2+0.84*28简便计算(递等式)

8.4*7.2+0.84*28简便计算(递等式)
8.4*7.2+0.84*28
=0.84*72+0.84*28
=0.84*(72+28)
=0.84*100
=84

8.4*7.2+0.84*28
=8.4×7.2+8.4×2.8
=8.4×10
=84

8.4*7.2+0.84*28
=8.4×﹙7.2+2.8﹚
=8.4×10
=84

8.4*7.2+0.84*28
=784*(7.2+2.8)
=8.4*10
=84

8.4*7.2+0.84*28
=8.4×﹙7.2+2.8﹚
=8.4×10
=84