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2.7+(11.2-2.7)*0.4怎样简便
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2.7+(11.2-2.7)*0.4怎样简便
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答案和解析
2.7+(11.2-2.7)×0.4
=2.7+11.2×0.4-2.7×0.4
=2.7×(1-0.4)+11.2×0.4
=2.7×0.6+11.2×0.4
=2.7×3×0.2+11.2×2×0.2
=8.1×0.2+22.4×0.2
=(8.1+22.4)×0.2
=30.5×0.2
=6.1
=2.7+11.2×0.4-2.7×0.4
=2.7×(1-0.4)+11.2×0.4
=2.7×0.6+11.2×0.4
=2.7×3×0.2+11.2×2×0.2
=8.1×0.2+22.4×0.2
=(8.1+22.4)×0.2
=30.5×0.2
=6.1
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