4.2×2.6-2.2×4.6的简便运算

4.2×2.6-2.2×4.6的简便运算
=4.2x2.6-2.2x2.6-2.2x2
=（4.2-2.2）x2.6-2.2x2
=2x2.6-2.2x2
=2x（2.6-2.2）
=2x0.4
=0.8

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