5.8×0.8+42×0.081的脱式计算简便算法151491703851514917?
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5.8×0.8+42×0.081
=5.8×0.8+4.2×10×0.081
=5.8×0.8+4.2×0.81
=5.8×0.8+4.2×(0.8+0.01)
=5.8×0.8+4.2×0.8+4.2×0.01
=(5.8+4.2)×0.8+0.042
=10×0.8+0.042
=8+0.042
=8.042
=5.8×0.8+4.2×10×0.081
=5.8×0.8+4.2×0.81
=5.8×0.8+4.2×(0.8+0.01)
=5.8×0.8+4.2×0.8+4.2×0.01
=(5.8+4.2)×0.8+0.042
=10×0.8+0.042
=8+0.042
=8.042
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