2.7x0.72+0.27x2.8,能用简便运算吗
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2.7×0.72+0.27×2.8
=2.7×0.72+2.7×0.1×2.8
=2.7×0.72+2.7×0.28
=2.7×(0.72+0.28)
=2.7×1
=2.7
=2.7×0.72+2.7×0.1×2.8
=2.7×0.72+2.7×0.28
=2.7×(0.72+0.28)
=2.7×1
=2.7
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