80%乘以X+(500-X)乘以60%=500X74%怎么做
问题描述:
80%乘以X+(500-X)乘以60%=500X74%怎么做
500X74%那个X是乘号
答
0.8x+0.6*500-0.6x=0.74*500x
370x-0.2x=300
x=0.81124
或者
0.8x+0.6*500-0.6x=0.74*500
0.2x=70
x=350那个*是不是乘号?是的