能用加减消元法解么?x=50(y+0.4) x=75(y-0.4) 解方程组,

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能用加减消元法解么?x=50(y+0.4)x=75(y-0.4)解方程组,能用加减消元法解么?x=50(y+0.4)x=75(y-0.4)解方程组,能用加减消元法解么?x=50(y+0.4)x=75(

能用加减消元法解么?x=50(y+0.4) x=75(y-0.4) 解方程组,
能用加减消元法解么?x=50(y+0.4) x=75(y-0.4) 解方程组,

能用加减消元法解么?x=50(y+0.4) x=75(y-0.4) 解方程组,
两式相减
x-x=75(y-0.4)-50(y-0.4)
0=75y+30-50y+20
25y=50
y=2
x=50x(2+0.4)=120
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