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7.5×23+31×2.5的简便运算

7.5x23+31x2.5 =2.5x3x23+31x2.5 =2.5x69+31x2.5 =2.5x(69+31) =2.5x100 =250

7.5*23 =7.5*(20+3) =7.5*20+7.5*3 =140+(7+0.5)*3 =140+7*3+7*0.5 =140+21+3.5 =161+3.5 =164.5 第二个同理,采纳吧,下班了,还在给你回答。

56×23+25×77+31×77 =56x23+(25+31)x77 =56x23+56x77 =56x(23+77) =56x100 =5600

(1)2.31×1.5+1.5×7.69=(2.31+7.69)×1.5=10×1.5=15;(2)23.4÷7.8-2.1=3-2.1=0.9;(3)4.5×0.4÷4.5×0.4=4.5÷4.5×0.4×0.4=1×0.4×0.4=0.16;(4)6.4×101-6.4=6.4×(101-1)=6.4×100=640;(5)4×1.98×0.25=4×0.25×1.98=1×1.98=1.98;(6)7...

你少打了一个47,首尾相加是60,在成起来就完了

8.99×23+33×31 =(9-0.01)×23+(23+10)×31 =(9-0.01+31)×23+31×10 =(40-0.01)×23+310 =40×23-0.01×23+310 =920+310-0.23 =1230-0.23 =1229.77

7/23×31分之3+16/23乘7/31+31分之7×12/23 =3/23+7/31+16/23x7/31+7/31x12/23 =(3/23+16/23+12/23)x7/31 =31/23x7/31 =7/23

222×31+23×666 =222×31+23×3×222 =222×31+69×222 =222×(31+69) =222×100 =22200

①57×18.31-4.31×57,=(18.31-4.31)×57,=14×57,=10;②29-(2425-79),=29-2425+79,=29+79-2425,=1-2425,=125;③(23-12)÷512+14,=16×125+14,=25+14,=1320;④(1-23+18)×24,=1×24-23×24+18×24,=24-16+3,=8+3,=11.

=(78+23)/31-31 =101/31-31 =4-23/31-31 =-27-23/31 =-27又23/31

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