已知(x-y)÷4=(2x+y)=5,且2x-3y=18,求3x-5y的值.
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已知(x-y)÷4=(2x+y)=5,且2x-3y=18,求3x-5y的值.
是“(x-y)÷4=(2x+y)÷5”
是“(x-y)÷4=(2x+y)÷5”
![已知(x-y)÷4=(2x+y)=5,且2x-3y=18,求3x-5y的值.](/uploads/image/z/841058-26-8.jpg?t=%E5%B7%B2%E7%9F%A5%28x-y%29%C3%B74%3D%282x%2By%29%3D5%2C%E4%B8%942x-3y%3D18%2C%E6%B1%823x-5y%E7%9A%84%E5%80%BC.)
x-y=4x5=20①
2x+y=5②
2x-3y=18③
①+②
3x=25
x=25/3
y=-35/3
代入③
2x-3y=50/3+105/3=155/3≠18
题目错误
2x+y=5②
2x-3y=18③
①+②
3x=25
x=25/3
y=-35/3
代入③
2x-3y=50/3+105/3=155/3≠18
题目错误
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