4.2×2.6+1.3×1.5+0.13怎么,运用乘法分配律?
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4.2×2.6+1.3×1.5+0.13
=4.2×2×1.3+1.3×1.5+0.1×1.3
=8.4×1.3+1.5×1.3+0.1×1.3
=1.3×(8.4+1.5+0.1)
=1.3×10
=13
=4.2×2×1.3+1.3×1.5+0.1×1.3
=8.4×1.3+1.5×1.3+0.1×1.3
=1.3×(8.4+1.5+0.1)
=1.3×10
=13
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