解方程组(1)x/2+y/3=2 0.2x+0.3y=2.8(2)x/4+y/3=4/3 3(x-4)=4(y+2)(3)(x+y)/6+(x-y)/10=3 (x+y)/6-(x-y)/10=-12、已知关于x、y的方程组2x-y=3 2kx+(k+1)y=10 的解是两个互为相反数,求k的值.3、A、B两码头相距80km,一船从A码
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![解方程组(1)x/2+y/3=2 0.2x+0.3y=2.8(2)x/4+y/3=4/3 3(x-4)=4(y+2)(3)(x+y)/6+(x-y)/10=3 (x+y)/6-(x-y)/10=-12、已知关于x、y的方程组2x-y=3 2kx+(k+1)y=10 的解是两个互为相反数,求k的值.3、A、B两码头相距80km,一船从A码](/uploads/image/z/761076-36-6.jpg?t=%E8%A7%A3%E6%96%B9%E7%A8%8B%E7%BB%84%EF%BC%881%EF%BC%89x%2F2%2By%2F3%3D2+0.2x%2B0.3y%3D2.8%282%29x%2F4%2By%2F3%3D4%2F3+3%28x-4%29%3D4%28y%2B2%29%283%29%28x%2By%29%2F6%2B%28x-y%29%2F10%3D3+%28x%2By%29%2F6-%28x-y%29%2F10%3D-12%E3%80%81%E5%B7%B2%E7%9F%A5%E5%85%B3%E4%BA%8Ex%E3%80%81y%E7%9A%84%E6%96%B9%E7%A8%8B%E7%BB%842x-y%3D3+2kx%2B%28k%2B1%29y%3D10+%E7%9A%84%E8%A7%A3%E6%98%AF%E4%B8%A4%E4%B8%AA%E4%BA%92%E4%B8%BA%E7%9B%B8%E5%8F%8D%E6%95%B0%2C%E6%B1%82k%E7%9A%84%E5%80%BC.3%E3%80%81A%E3%80%81B%E4%B8%A4%E7%A0%81%E5%A4%B4%E7%9B%B8%E8%B7%9D80km%2C%E4%B8%80%E8%88%B9%E4%BB%8EA%E7%A0%81)
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