用加减法解下列方程 (1){4x-4y=1,3x+2y=2 (2) {2x+3y=-4,x+2/1y=33a+b/2=1+a/3,a-3b=2 (4) x/2-y/3=4.x/3+y/6=5(5)2s+t/3=3s-2t/8=3 (注:都需加减法解) 要快!马上!
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![用加减法解下列方程 (1){4x-4y=1,3x+2y=2 (2) {2x+3y=-4,x+2/1y=33a+b/2=1+a/3,a-3b=2 (4) x/2-y/3=4.x/3+y/6=5(5)2s+t/3=3s-2t/8=3 (注:都需加减法解) 要快!马上!](/uploads/image/z/91053-45-3.jpg?t=%E7%94%A8%E5%8A%A0%E5%87%8F%E6%B3%95%E8%A7%A3%E4%B8%8B%E5%88%97%E6%96%B9%E7%A8%8B+%281%29%7B4x-4y%3D1%2C3x%2B2y%3D2+%282%29+%7B2x%2B3y%3D-4%2Cx%2B2%2F1y%3D33a%2Bb%2F2%3D1%2Ba%2F3%2Ca-3b%3D2+++++++%284%29+x%2F2-y%2F3%3D4.x%2F3%2By%2F6%3D5%285%292s%2Bt%2F3%3D3s-2t%2F8%3D3+%EF%BC%88%E6%B3%A8%EF%BC%9A%E9%83%BD%E9%9C%80%E5%8A%A0%E5%87%8F%E6%B3%95%E8%A7%A3%EF%BC%89++%E8%A6%81%E5%BF%AB%21%E9%A9%AC%E4%B8%8A%21)
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用加减法解下列方程 (1){4x-4y=1,3x+2y=2 (2) {2x+3y=-4,x+2/1y=33a+b/2=1+a/3,a-3b=2 (4) x/2-y/3=4.x/3+y/6=5(5)2s+t/3=3s-2t/8=3 (注:都需加减法解) 要快!马上!
用加减法解下列方程 (1){4x-4y=1,3x+2y=2 (2) {2x+3y=-4,x+2/1y=3
3a+b/2=1+a/3,a-3b=2 (4) x/2-y/3=4.x/3+y/6=5
(5)2s+t/3=3s-2t/8=3 (注:都需加减法解)
要快!马上!
用加减法解下列方程 (1){4x-4y=1,3x+2y=2 (2) {2x+3y=-4,x+2/1y=33a+b/2=1+a/3,a-3b=2 (4) x/2-y/3=4.x/3+y/6=5(5)2s+t/3=3s-2t/8=3 (注:都需加减法解) 要快!马上!
(1){4x-4y=1 ①,3x+2y=2 ②
①+2*②得x=0.5 所以y=0.25
(2) {2x+3y=-4①,x+2=3 y ②
①+② 得x=-2 所以y=0 (此题不明白你的题目意思x+2/1y=3 )
其他题目也是照这种方法,消去一个未知数,即可解出
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