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1.35x4.2x0.8简便算法

1.35×4.2×0.8 =1.35×0.8×4.2 =1.08×4.2 =1×4.2+0.08×4.2 =4.2+0.336 =4.536 请点个采纳呗,谢谢!

=(1.25+0.1)×4.2×0.8 =(1.25×0.8+0.1×0.8)×4.2 =(10+0.08)×4.2 =10×4.2+0.08×4.2 =42+0.336 =42.336

8.7+1.2x0.35 =8.7+(1+0.2)x0.35 =8.7+1x0.35+0.2x0.35 =8.7+0.35+0.07 =9.12

1.35*4.2*0.8=(1.25+0.1)*4.2*0.8=1.25*4.2*0.8+0.1*4.2*0.8=4.2+0.336=4.536 0.074*1.8*20.5=0.074*1.8*(20+0.5)=0.074*1.8*20+0.074*1.8*0.5=0.075*1.8*20-0.001*1.8*20+0.074*0.9=2.7-0.036+0.0666=2.7306

解: 8×4.6+35×0.8-6.1×8 =8×4.6+3.5×8-6.1×8 =8*(4.6+3.5-6.1) =8*2 =16

1.35/13.5*0.8=0.8

3.5×0.19+0.35×8.1 =0.35×1.9+0.35×8.1 =0.35×(1.9+8.1) =0.35×10 =3.5

12.5×0.35×0.8×1/35 =(12.5×0.8)×(0.35×1/35) =10×0.01 =0.1 望采纳,谢谢!

20.1x35.22-3.522 =20.1x35.22-35.22x0.1 =(20.1-0.1)x35.22 =20x35.22 =704.4

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