4.2*1.35+2.1*3.5+6.2*6.9的简便算法？
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4.2*1.35+2.1*3.5+6.2*6.9
=2.1*2.7+2.1*3.5+6.2*6.9
=2.1*(2.7+3.5)+6.2*6.9
=2.1*6.2+6.2*6.9
=6.2*(2.1+6.9)
=6.2*(10-1)
=62-6.2
=55.8
=2.1*2.7+2.1*3.5+6.2*6.9
=2.1*(2.7+3.5)+6.2*6.9
=2.1*6.2+6.2*6.9
=6.2*(2.1+6.9)
=6.2*(10-1)
=62-6.2
=55.8
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4.2×1.35+2.1×3.5+6.2×6.9
=2.1×2×1.35+2.1×3.5+6.2×6.9
=2.1×2.7+2.1×3.5+6.2×6.9
=2.1×（2.7+3.5）+6.2×6.9
=2.1×6.2+6.2×6.9
=6.2×（2.1+6.9）
=6.2×9
=55.8
=2.1×2×1.35+2.1×3.5+6.2×6.9
=2.1×2.7+2.1×3.5+6.2×6.9
=2.1×（2.7+3.5）+6.2×6.9
=2.1×6.2+6.2×6.9
=6.2×（2.1+6.9）
=6.2×9
=55.8
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4.2*1.35+2.1*3.5+6.2*6.9的简便算法？你好，这个算式可以进行简便计算的，可以变换为2.1×（2×1.35+3.5）+6.2×6.9=55.8。
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