80%乘以X+(500-X)乘以60%=500X74%怎么做500X74%那个X是乘号
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80%乘以X+(500-X)乘以60%=500X74%怎么做500X74%那个X是乘号80%乘以X+(500-X)乘以60%=500X74%怎么做500X74%那个X是乘号80%乘以X+(500-X)
80%乘以X+(500-X)乘以60%=500X74%怎么做500X74%那个X是乘号
80%乘以X+(500-X)乘以60%=500X74%怎么做
500X74%那个X是乘号
80%乘以X+(500-X)乘以60%=500X74%怎么做500X74%那个X是乘号
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
X=350
(1+40%)乘以X乘以80%—X=15
(1+40%)乘以X乘以80%—X=15 (1+40%)乘以X乘以80%—X=15
80%乘以X+(500-X)乘以60%=500X74%怎么做500X74%那个X是乘号
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