3.12+3.12*7.8+1.2*3.12简便算法

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3.12+3.12*7.8+1.2*3.12简便算法
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3.12+3.12*7.8+1.2*3.12简便算法
3.12+3.12*7.8+1.2*3.12简便算法

3.12+3.12*7.8+1.2*3.12简便算法
3.12+3.12×7.8+1.2×3.12
=3.12×(1+7.8+1.2)
=3.12×10
=31.2
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3.12+3.12*7.8+1.2*3.12
=3.12*(1+7.8+1.2)
=3.12*10
=31.2

3.12+3.12*7.8+1.2*3.12
=3.12*(1+7.8+1.2)
=3.12*10
=31.2

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=3.12*(1+7.8+1.2)
=3.12*10
=31.2

= 3.12 + 3.12 *(1.2+7.8)
= 3.12 * (1 + 9)
= 31.2