1、用代入法解方程.(1) { x+2y=9 3x-2y=-1 (2) { 3u+2t=7 6u-2t=11 (3) { 2a+b=3 3a+b=4 2、用加减法解方程组.(下面方程组的内容和第一题相同.) (1)…… (2)…… (3)……
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![1、用代入法解方程.(1) { x+2y=9 3x-2y=-1 (2) { 3u+2t=7 6u-2t=11 (3) { 2a+b=3 3a+b=4 2、用加减法解方程组.(下面方程组的内容和第一题相同.) (1)…… (2)…… (3)……](/uploads/image/z/3175659-27-9.jpg?t=1%E3%80%81%E7%94%A8%E4%BB%A3%E5%85%A5%E6%B3%95%E8%A7%A3%E6%96%B9%E7%A8%8B.%EF%BC%881%EF%BC%89+%7B+x%2B2y%3D9+3x-2y%3D-1+%EF%BC%882%EF%BC%89+%7B+3u%2B2t%3D7+6u-2t%3D11+%283%29+%7B+2a%2Bb%3D3+3a%2Bb%3D4+2%E3%80%81%E7%94%A8%E5%8A%A0%E5%87%8F%E6%B3%95%E8%A7%A3%E6%96%B9%E7%A8%8B%E7%BB%84.%EF%BC%88%E4%B8%8B%E9%9D%A2%E6%96%B9%E7%A8%8B%E7%BB%84%E7%9A%84%E5%86%85%E5%AE%B9%E5%92%8C%E7%AC%AC%E4%B8%80%E9%A2%98%E7%9B%B8%E5%90%8C.%EF%BC%89+%EF%BC%881%EF%BC%89%E2%80%A6%E2%80%A6+%EF%BC%882%EF%BC%89%E2%80%A6%E2%80%A6+%EF%BC%883%EF%BC%89%E2%80%A6%E2%80%A6)
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