60%x+25=40 x+30%x=52 19-120%x=7 4分之3x-5%x=17.5 x-10%x=18 (1-25%)x=36 2x+30%x=9.2
人气:159 ℃ 时间:2019-08-19 16:29:45
解答
把百分数转化为小数再计算,转化方法是把百分号去掉把小数点往前移两位,如60%:去掉百分号是60(60.),小数点往前移两位变成0.60;再如5%:去掉百分号是5(5.),小数点往前移两位变成0.05.4分之3=3/4=0.75.于是上述方...
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