1.3x4.2+2.6×2.9简算脱式计算？
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1.3×4.2+2.6×2.9
=1.3×4.2+1.3×2×2.9
=1.3×4.2+1.3×5.8
=1.3×(4.2+5.8)
=1.3×10
=13
=1.3×4.2+1.3×2×2.9
=1.3×4.2+1.3×5.8
=1.3×(4.2+5.8)
=1.3×10
=13
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