2.25*3.7+7.3*5.25-5.25怎样简便计算？
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2.25×3.7+7.3×5.25-5.25怎样简便计算？
2.25×3.7+7.3×5.25-5.25
=2.25×3.7+（7.3-1）×5.25
=2.25×3.7+6.3×5.25
=2.25×3.7+6.3×（3+2.25）
=2.25×3.7+6.3×3+6.3×2.25
=2.25×（3.7+6.3）+6.3×3
=2.25×10+6.3×3
=22.5+18.9
=41.4
2.25×3.7+7.3×5.25-5.25
=2.25×3.7+（7.3-1）×5.25
=2.25×3.7+6.3×5.25
=2.25×3.7+6.3×（3+2.25）
=2.25×3.7+6.3×3+6.3×2.25
=2.25×（3.7+6.3）+6.3×3
=2.25×10+6.3×3
=22.5+18.9
=41.4
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2.25×3.7+7.3×5.25-5.25
＝2.25×（4-0.3）+5.25×（7.3-1）
＝2.25×4-2.25×0.3+5.25×6.3
＝9-2.25×0.3+5.25×（6+0.3）
＝9-2.25×0.3+5.25×6+5.25×0.3
＝9+5.25×6+（5.25-2.25）×0.3
＝9+31.5+0.9
＝41.4
＝2.25×（4-0.3）+5.25×（7.3-1）
＝2.25×4-2.25×0.3+5.25×6.3
＝9-2.25×0.3+5.25×（6+0.3）
＝9-2.25×0.3+5.25×6+5.25×0.3
＝9+5.25×6+（5.25-2.25）×0.3
＝9+31.5+0.9
＝41.4
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