x-y=7……(1)
3x+5y=-3……(2)
(1)x5得
5x-5y=35……(3)
(2)+(3)得
8x=32
x=4
把x=4代人(1)得
4-y=7
y=-3
∴x=4 y=-3
5- x/x-1=3/x-1
5(x-1)-x=3
5x-5-x=3
4x=8
x=2
檢驗(yàn)x=2時(shí) (x-1)不等于0
∴x=2是原方程的解
1.x-y=7,3x+5y=-3 2.5- x/x-1=3/x-1
1.x-y=7,3x+5y=-3 2.5- x/x-1=3/x-1
數(shù)學(xué)人氣:704 ℃時(shí)間:2020-09-30 15:06:31
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