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7.58x3.8+0.38x24.2简便?
1个回答
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7.58×3.8+0.38×24.2
=75.8×0.1×3.8+0.38×24.2
=75.8×0.38+0.38×24.2
=(75.8+24.2)×0.38
=100×0.38
=3800
=75.8×0.1×3.8+0.38×24.2
=75.8×0.38+0.38×24.2
=(75.8+24.2)×0.38
=100×0.38
=3800
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