9/20÷[1/2×(2/3+4/5)]简算

9\/20÷[1\/2×(2\/3+4\/5)]简算
9\/20÷[1\/2×（2\/3+4\/5）]=9\/20÷（1\/3+2\/5）=9\/20÷9\/15 =9\/20×15\/9 =15\/20 =3\/4

9\/20\/【2\/3*(0.4+4\/5)】如何简算
您好：9\/20\/【2\/3*(0.4+4\/5)】=9\/20÷【2\/3x(2\/5+4\/5)】=9\/20÷（2\/3x6\/5）=9\/20÷4\/5 =9\/16 如果本题有什么不明白可以追问，如果满意记得采纳 如果有其他问题请采纳本题后另发点击向我求助，答题不易，请谅解，谢谢。祝学习进步！

9\/20÷括号1\/2×括号2\/5+4\/5括号括号简算
9\/20÷【1\/2×（2\/5+4\/5）】=9\/20÷（1\/2x6\/5）=9\/20÷3\/5 =3\/4

20÷[1\/2×(2\/5+3\/4)]怎么简算?
20÷[1\/2×（2\/5+3\/4）]=20÷【1\/2x（8\/20+15\/20）】=20÷（1\/2x23\/20）=20÷23\/10 =200\/23

能简便的要简算计算题两道
8分之7÷5+8分之7÷2 =7\/8x1\/5+7\/8x1\/2 =7\/8x(1\/5+1\/2)=7\/8x7\/10 =49\/80 20分之9÷[2分之1x（5分之2+5分之4）=9\/20÷(1\/2x6\/5)=9\/20÷3\/5 =9\/20x5\/3 =3\/4

9\/26÷[1\/2ⅹ(2\/5+4\/5)]能简算的要简算?
9\/26÷[1\/2ⅹ(2\/5+4\/5)]=9\/26÷（1\/5+2\/5）=9\/26÷（3\/5）=9\/26×5\/3 =15\/26

9\/20÷(1\/3--1\/5)×9\/14 能简算就要简算
9\/20÷(1\/3-1\/5)×9\/14 =9\/20÷(5\/15-3\/15)×9\/14 =9\/20×15\/2×9\/14 =(9×15×9)\/(20×2×14) (这一步可约分，上下各除以5）=(9×3×9)\/(4×2×14)=243\/112

21\/3×5\/42×5\/3×1\/2+4\/3怎么用简便运算
21\/3×5\/42×5\/3×1\/2+4\/3怎么用简便运算:简算过程如下:21\/3×5\/42×5\/3×1\/2+4\/3 =7×5\/42×5\/3×1\/2+4\/3 =5\/6×5\/3×1\/2+4\/3 =25\/18×1\/2+4\/3 =25\/36+48\/36 =73\/36=2又1\/36 其实就是先算出21\/3=21÷3=7，再用7和5\/42约分。剩下的口算就可以了 ...

把(1\/1)*2+(1\/2)*3+...+(1\/99
要算式思路 1\/1*2+1\/2*3+1\/3*4···+1\/99*100 =1\/(1×2)+1\/(2×3)+...+1\/(99×100) =(1-1\/2)+(1\/2-1\/3)+...+(1\/99-1\/100) =1-1\/2+1\/2-1\/3+...+1\/99-1\/100 =1-1\/100 =99\/100 类似：1\/[a*(a+n)]=(1\/n)*[1\/a-1\/(a+n)] ...

2\/3÷[(3\/4-1\/2)x4\/5]能简算的要简算。
回答：2\/3÷[(3\/4-1\/2)x4\/5] =2\/3÷【3\/4×4\/5-1\/2x4\/5] =2\/3÷(3\/5-2\/5) =2\/3÷1\/5 =2\/3×5 =10\/3