{4x=5y,3x=5(y-1)解方程组
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{4x=5y,3x=5(y-1)解方程组
{4x=5y,3x=5(y-1)
解方程组
{4x=5y,3x=5(y-1)解方程组
原方程化为:
4x=5y……(1)
3x=5y-5……(2)
由(2)得:5y=3x+5 代入(1)
4x=3x+5
x=5
代回:y=4
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