4.2乘以2.6加1.3×1.5+0.13的简便计算方法？
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4.2×2.6+1.3×1.5+0.13
=4.2×2×1.3+1.3×1.5+1.3×0.1
=8.4×1.3+1.3×1.5+1.3×0.1
=(8.4+1.5+0.1)×1.3
=10×1.3
=13
=4.2×2×1.3+1.3×1.5+1.3×0.1
=8.4×1.3+1.3×1.5+1.3×0.1
=(8.4+1.5+0.1)×1.3
=10×1.3
=13
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