用加减法解方程组 (1)4x+3y=7,4x-3y=5; (2)3m+2n=16,3m-n=1 (3)2x+3y=4 4x-4y=3 (4)5x-2y=3 x+6y=11
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![用加减法解方程组 (1)4x+3y=7,4x-3y=5; (2)3m+2n=16,3m-n=1 (3)2x+3y=4 4x-4y=3 (4)5x-2y=3 x+6y=11](/uploads/image/z/320410-10-0.jpg?t=%E7%94%A8%E5%8A%A0%E5%87%8F%E6%B3%95%E8%A7%A3%E6%96%B9%E7%A8%8B%E7%BB%84+%281%294x%2B3y%3D7%2C4x-3y%3D5%3B+%282%293m%2B2n%3D16%2C3m-n%3D1+%283%EF%BC%892x%2B3y%3D4+4x-4y%3D3+%284%295x-2y%3D3+x%2B6y%3D11)
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