
8.2-4.2*1.05简便计算?
2个回答
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8.2 - 4.2*1.05
= 4 + 4.2 - 4.2*1.05
= 4 + 4.2×( 1 - 1.05)
= 4 - 4.2×0.05
= 4 - 4.2×0.05
= 4 - 0.21
= 3.79
= 4 + 4.2 - 4.2*1.05
= 4 + 4.2×( 1 - 1.05)
= 4 - 4.2×0.05
= 4 - 4.2×0.05
= 4 - 0.21
= 3.79
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