4.2×6.7+6.7×1.2+3.3×5.4简便计算
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4.2×6.7+6.7×1.2+3.3×5.4
=6.7×(4.2+1.2)+3.3×5.4
=6.7×5.4+3.3×5.4
=5.4×(6.7+3.3)
=5.4×10
=54
=6.7×(4.2+1.2)+3.3×5.4
=6.7×5.4+3.3×5.4
=5.4×(6.7+3.3)
=5.4×10
=54
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