3.1×1.75 3.04×6.9 1.29×3.1如何简便计算？
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3.1×1.75+3.04×6.9+1.29×3.1
=(3.1×1.75+1.29×3.1)+3.04×6.9
= 3.1×(1.75+1.29)+3.04×6.9
= 3.1×3.04+3.04×6.9
= (3.1+6.9)×3.04
= 10×3.04
= 30.4
=(3.1×1.75+1.29×3.1)+3.04×6.9
= 3.1×(1.75+1.29)+3.04×6.9
= 3.1×3.04+3.04×6.9
= (3.1+6.9)×3.04
= 10×3.04
= 30.4
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