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0.75×4.9+0.25×2.4简便计算
1个回答
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0.75×4.9+0.25×2.4
=0.25×3×4.9+0.25×2.4
=0.25×14.7+0.25×2.4
=0.25×(14.7+2.4)
=0.25×17.1
=4.275
=0.25×3×4.9+0.25×2.4
=0.25×14.7+0.25×2.4
=0.25×(14.7+2.4)
=0.25×17.1
=4.275
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