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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

七点5+23乘二点5×31简便运算 解: 题目符号打错,应该是: 7.5×23+2.5×31 =2.5×69+2.5×31 =2.5×(69+31) =2.5×100 =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。

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

(首项+末项)x项数÷2 这是我上中学参加奥林匹克竞赛时学的 望采纳~!!!! (21+49)x15÷2=525 15就是一共15个数,表示项数

31又23分之7x1/32 =(32-16/23)x1/32 =32x1/32-16/23x1/32 =1-1/46 =45/46

46×125+23×125+125×31 =125×(46+23+31) =125×100 =12500

8.4×23+31×2.8 =2.8x3x23+31x2.8 =2.8x69+31x2.8 =2.8x(69+31) =2.8x100 =280 希望能帮到你

解: 11+14+17+20+23+26+29+31+34+37 =(11+29)x7÷2+(31+37)x3÷2 =20x7+34x3 =140+102 =242

14/23*23+17/31*23+23=(14/23+17/31+1)*23

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