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y=5:3 x:2=7:3 2x-y-2=34 2x+3y+z=38 3x+4y+2z=56 4x+5y+z=66
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相关问题
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2x+3y+z=38 ① 3x+4y+2z=56 ② 4x+5y+z=66 ③
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1、2x+y+3z=38 2、3x+2y+4z=56 3、4x+y+5z=66
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x+y+z=2 ① 2x+3y+z=38 ① x+y=3 3x-y-4z=5 ② 3x+4y+2z+56 ② y+z=5
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解方程组：2x+3y+z=38,3x+4y +2z=56,4x+5y+z=66
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解方程组2x+3y+z=38.3x+4y+2z=56.4x+5y+z=66
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用加减法解{2X+3Y+Z=38 3X+4Y+2Z=56 4X+5Y+Z=66
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2x-3y+z=28 3x+4y+z=56 4x+5y-z=66
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(1)2X+4Y+3Z=93X-2Y+5Z=115X-6Y+7Z=13(2)X:Y=3:2Y:Z=5:4X+Y+Z=66
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x+2z=3 x+y+z=2 2x+y=2 3x-y-4z=5 2y+z=7 2x+3y-2z=0
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x:y=3:2 y:z=5:4 x+y+z=66