几道数学解方程和简便运算1.0.8：x＝4/3　：0.22.（1/4　x＋0.33）÷1/5＝19.53.2.5×0.875＋0._数学解答

几道数学解方程和简便运算
1.0.8：x＝4/3　：0.2
2.（1/4　x＋0.33）÷1/5＝19.5
3.2.5×0.875＋0.25×1.25
4.999 8/9＋99 8/9＋9 8/9＋ 1/3
5.2.5－5/12－1/6÷2/7

人气：405 ℃　时间：2020-06-27 02:56:23

解答

1.0.8：x＝4/3　：0.24x/3=0.8*0.24x/3=0.16x=0.16*3/4x=0.122.（1/4　x＋0.33）÷1/5＝19.5(1/4x+0.33)=19.5×1/51/4x+0.33=3.91/4x=3.9-0.331/4x=3.57x=3.57×4x=14.283.2.5×0.875＋0.25×1.25=0.25×8.75+0.25×...