3X+4Y=10 (1) 4X+3Y=11 (2) (1)+(2) 7X+7Y=21 X+Y=3 3X+3Y=9 (3) (2)-(3) X=2 Y=3-X=1第五步,x+y为什么=3?
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![3X+4Y=10 (1) 4X+3Y=11 (2) (1)+(2) 7X+7Y=21 X+Y=3 3X+3Y=9 (3) (2)-(3) X=2 Y=3-X=1第五步,x+y为什么=3?](/uploads/image/z/2000492-44-2.jpg?t=3X%2B4Y%3D10+%281%29+4X%2B3Y%3D11+%282%29+%281%29%2B%282%29+7X%2B7Y%3D21+X%2BY%3D3+3X%2B3Y%3D9+%283%29+%282%29-%283%29+X%3D2+Y%3D3-X%3D1%E7%AC%AC%E4%BA%94%E6%AD%A5%2Cx%2By%E4%B8%BA%E4%BB%80%E4%B9%88%3D3%3F)
3X+4Y=10 (1) 4X+3Y=11 (2) (1)+(2) 7X+7Y=21 X+Y=3 3X+3Y=9 (3) (2)-(3) X=2 Y=3-X=1第五步,x+y为什么=3?
3X+4Y=10 (1) 4X+3Y=11 (2) (1)+(2) 7X+7Y=21 X+Y=3 3X+3Y=9 (3) (2)-(3) X=2 Y=3-X=1
第五步,x+y为什么=3?
3X+4Y=10 (1) 4X+3Y=11 (2) (1)+(2) 7X+7Y=21 X+Y=3 3X+3Y=9 (3) (2)-(3) X=2 Y=3-X=1第五步,x+y为什么=3?
7X+7Y=21
两边同除以7
X+Y=3
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