999.9×2.6+333.3×1.2简便计算

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999.9×2.6+333.3×1.2简便计算
999.9×2.6+333.3×1.2简便计算

999.9×2.6+333.3×1.2简便计算
999.9×2.6+333.3×1.2
=333.3×3×2.6+333.3×1.2
=333.3×(7.8+1.2)
=333.3×9
=333.3×(10-1)
=3333-333.3
=2999.7

999.9×2.6+333.3×1.2
=999.9×2.6+333.3×3×0.4
=999.9×2.6+999.9×0.4
=999.9×(2.6+0.4)
=999.9×3
=(999.9+0.1-0.1)×3
=(1000-0.1)×3
=1000×3-0.1×3
=3000-0.3
=2999.7