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(2.275+0.625)×0.28等于多少?递等式 简便运算

[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

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

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 =2.9×0.28 =0.812

(2.275+0.635)×0.28简便运算 (2.275+0.635)×0.28 =0.28*2.91 = 8.4681 直接计算

(3.275+0.625)×3.32×25 =(3+0.275+0.625+0.1-0.1)×4×0.83×25 =(4-0.1)×4×25×0.83 =4×100×0.83-0.1×100×0.83 =332-8.3 =323.7

(2.275x0.682)x0.28 =1.55155×0.28 =0.434343 没有简便,脱式计算

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

(2.275十0.625)x0.18 =2.9*0.18 =(3-0.1)*0.18 =3*0.18-0.1*0.18 =0.54-0.018 =0.522

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