www.wfdy.net > 0.125×1/9+1/9×7/8,怎么做?发图片.

0.125×1/9+1/9×7/8,怎么做?发图片.

8.9×0.1+0.1×1 =0.1×(8.9+0.1) =0.1×9 =0.9

8/9×0.125+1/9÷8 =(8/9+1/9)÷8 =1/8 =0.125

7.1*1/8+1.9*12.5%-0.125 =7.1*0.125+1.9*0.125-0.125 =(7.1+1.9-1)*0.125 =8*0.125 =1

(1/9+1/6)÷5/18 =(2/18+3/18)÷5/18 =5/18x18/5 =1

(2/9+5/18)÷1/9 =(2/9+5/18)×9 =2/9×9+5/18×9 =2+2.5 =4.5

如图

原式= (1/2)(2/3)(3/4)(4/5)(5/6)(6/7)(7/8)(8/9)/(0.1+0.9+0.2+0.8+0.3+0.7+0.4+0.6+0.5) 分子可以约分,约分后很简单,可得分子为1/9,分母组合后算出来是4.5,分子除以分母 原式=1/9/4.5=2/81

=(1-1/2)+(1-1/3)+...(1-1/10) =9-(1/2+1/3+...1/10) =9-[1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9+1/10] =9-[(1/2+1/3+1/6)+(1/4+1/5+1/10)+1/7+1/8+1/9] =9-(1+11/20+1/8+1/7+1/9) =9-(1+27/40+1/9+1/7) =9-(1+283/360+1/7) =8-2341/2520

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