3x-2y=1 4x-5y
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3x-2y=1 4x-5y
3x-2y=1 4x-5y
3x-2y=1 4x-5y
条件不完全.补充后给你解答.4x-5y是4x=5y还是缺少了等号后的值?
3x-2y=1 ①
4x-5y=3 ②
①式乘以5得:15x-10y=5 ③
②式乘以2得:8x-10y=6 ④
③-④得:15x-10y-8x+10y=5-6
7x=-1
x=-1/7
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3x-2y=1 ①
4x-5y=3 ②
①式乘以5得:15x-10y=5 ③
②式乘以2得:8x-10y=6 ④
③-④得:15x-10y-8x+10y=5-6
7x=-1
x=-1/7
把x=-1/7代入①得:3x(-1/7)-2y=1
-3/7-2y=1
y=-5/7
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