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6.2×2.1%2.128%2.8×0.15脱式简便计算

6.2×2.1-2.128-2.8×0.15 =6.2×2.1-2.128-1.4×0.3 =(6+0.2)x2.1-2.128-0.42 =12.6+0.42-2.128-0.42 =12.6-2.128 =10.472

解 : 128/6=21......余6 答: 等于21余6。

1.39+3.8+0.61+6.2 85×101 =1.39+061+3.8+6.285x(100+1) =2+3.8+6.285x100+6.285x1 =5.8+628.5+6.285 =640.585 在式子1.39+3.8+0.61+6.2 85×101中,可以把1.39+061应用加法结合律结合起来,比较容易计算。 6.2 85×101可以变为6.285x(100+1)...

(1)772-317+128×5,=772-317+640,=455+640,=1095;(2)(1112-34)÷(2-12),=212÷32,=19;(3)1.75+6.8+3.2+0.25,=(1.75+0.25)+(6.8+3.2),=2+10,=12;(4)17×99+17,=17×(99+1),=17×100,=1700;(5)120÷[45×(1-89)],=1...

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