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(2.275+0.625)×0.28等于多少?递等式 简便运算

(2.275+0.625)×0.28 =2.9 ×0.28 =3 ×0.28-0.28x0.1 =0.84-0.028 =0.812

解:采用分配律 原式=(2.275+0.625)×0.28 =2.9x0.28 =(3-0.1)x0.28 =3x0.28-0.1x0.28 =0.84-0.028 =0.812

(2.275+0.625)×0.28 =0.28*(3-0.1) =0.28*3-0.28*0.1 =0.84-0.028 =0.812

[2+0.275十(1一0.275)]x0.28=(2十0.275十1一0.275)Xo.28=3Xo.28=0.84

2.32 解析: (2.275+0.625)×0.8 =2.9×0.8 =(3-0.1)×0.8 =2.4-0.08 =2.32

(2.275 1.275)乘3.8乘25怎样巧算 (2.275 1.275)乘3.8乘25 =3.55*3.8*25 = 337.25 直接计算

75.2×0.6÷0.3 =75.2×(0.6÷0.3) =75.2×2 =150.4

(2.275+45÷0.625)X72 =(2.275+9X8)X72 =74.275X70+74.275X2 =5199.25+148.55 =5347.8

3.275+0.625)*3.32*25 = 323.7

2.275 0点6255的和×0点二八的简便计算 =(2.275+0.6255)*0.28 =2.9005*0.28 =0.81214

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