shuihuijiezhedaofangcheng 1/3x乘以0.5+1/4（88-x)乘以0.7=15谢谢
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shuihuijiezhedaofangcheng1/3x乘以0.5+1/4（88-x)乘以0.7=15谢谢shuihuijiezhedaofangcheng1/3x乘以0.5+1/4（88-x)乘以
shuihuijiezhedaofangcheng 1/3x乘以0.5+1/4（88-x)乘以0.7=15谢谢
shuihuijiezhedaofangcheng 1/3x乘以0.5+1/4（88-x)乘以0.7=15谢谢
shuihuijiezhedaofangcheng 1/3x乘以0.5+1/4（88-x)乘以0.7=15谢谢
先同时乘以10
5/3x+7/4（88-x)=150
同时乘以12
20x+21（88-x)=1800
-x+1848=1800
x=48