999.9×2.6+333.3×1.2简便计算
问题描述：
999.9×2.6+333.3×1.2简便计算
答
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
答
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