(1)2X-Y=1 3X-2Y =1 (2)4X-3Y=11 2X+Y=13 (3)3X+Y=1 1/2X+1/4Y=0 (4)5(Y-1)=3(X+5) 3(X-1)=Y+5麻烦把过程写上
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![(1)2X-Y=1 3X-2Y =1 (2)4X-3Y=11 2X+Y=13 (3)3X+Y=1 1/2X+1/4Y=0 (4)5(Y-1)=3(X+5) 3(X-1)=Y+5麻烦把过程写上](/uploads/image/z/1617513-33-3.jpg?t=%281%292X-Y%3D1+3X-2Y+%3D1+%282%294X-3Y%3D11+2X%2BY%3D13+%283%293X%2BY%3D1+1%2F2X%2B1%2F4Y%3D0+%284%295%28Y-1%29%3D3%28X%2B5%29+3%28X-1%29%3DY%2B5%E9%BA%BB%E7%83%A6%E6%8A%8A%E8%BF%87%E7%A8%8B%E5%86%99%E4%B8%8A)
(1)2X-Y=1 3X-2Y =1 (2)4X-3Y=11 2X+Y=13 (3)3X+Y=1 1/2X+1/4Y=0 (4)5(Y-1)=3(X+5) 3(X-1)=Y+5麻烦把过程写上
(1)2X-Y=1 3X-2Y =1 (2)4X-3Y=11 2X+Y=13 (3)3X+Y=1 1/2X+1/4Y=0 (4)5(Y-1)=3(X+5) 3(X-1)=Y+5
麻烦把过程写上
(1)2X-Y=1 3X-2Y =1 (2)4X-3Y=11 2X+Y=13 (3)3X+Y=1 1/2X+1/4Y=0 (4)5(Y-1)=3(X+5) 3(X-1)=Y+5麻烦把过程写上
大概步骤
先把每小题的两个式子都按顺序编上号①②
(1)①×2—②得X=1 ,将X=1带入②得3—2Y=1,故Y=1
(2)②×2—①得5Y=15 Y=3,将Y=3带入①得4X—9=11,故X=5
(3)①-②×4得X=1,将X=1带入①得3+Y=1,故Y=﹣2
(4)先化简得3X—5Y=﹣20 ①
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先把每小题的两个式子都按顺序编上号①②
(1)①×2—②得X=1 ,将X=1带入②得3—2Y=1,故Y=1
(2)②×2—①得5Y=15 Y=3,将Y=3带入①得4X—9=11,故X=5
(3)①-②×4得X=1,将X=1带入①得3+Y=1,故Y=﹣2
(4)先化简得3X—5Y=﹣20 ①
3X—Y=8 ②
②-①得4Y=28,Y=7
将Y=7带入②得3X—7=8,X=5
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