6x-5y=600 5x-6y=60
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6x-5y=600 5x-6y=60
6x-5y=600 5x-6y=60
6x-5y=600 5x-6y=60
1式乘5-2式乘6得11y=2640
y=240
x=300
x=300 y=240
用(6X-5Y)*5=600*5即30X-25Y=3000用@表示
(5X-6Y)*6=60*6即30X-36Y=360用&表示
用@-&即可得到 11Y=2640即Y=240
然后用Y=240代入@的中,就可以得到X=300
将方程6x-5y=600 化为x=(600+5y)/6=100+5y/6
把x带入方程5x-6y=60中 得到结果x=300,y=240
(x+y)/6+(x-y)/10=1,(x+y)/6-(x-y)/10=5
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x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
(5x-6y)(x+y)=0(x不等于y),则y/x=
3x+5y-(x+y)=6 2(x+y)-3x=-7
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已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值
例X=1 y=21.X+Y=5 X-Y=15 2.2X+3Y=4 5X+6Y=7 3.X+3Y=5 3X+Y=-1 4.2X+Y=3 3X+5Y=11 5.4X+3Y=6 2X+Y=4 6.X+Y=180 X=3Y-10 7.3X-2Y=3 2X-Y=7 8.5X+3Y=7Y X+Y=45 9.3X+4Y=126X+8Y=24 X:6Y=1:4 10.X+Y=138 X-45=Y+53 11.X+Y=60 14Y=20X 12.2X+3Y=15.5 5X+6Y=35 13.X+Y=170 3
把(x-y)看作一个整体,化解:5(x-y)+2(x-y)-4(x-y)= 3(x-y)把(x-y)看作一个整体,化解:5(x-y)+2(x-y)-4(x-y)=3(x-y)²-4(x-y)+7(x-y)-6(x-y)²=
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{x+y=1 ,xy=-6{x(2x-3)=0,y=x²-1{(3x+4y-3)(3x+4y+3)=0,3x+2y=5{(x-y+2)(x+y)=0,x²+y²=8{(x+y)((x+y-1)=0,(x-y)(x-y-1)=0
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已知:3x-5y=0,求x/y,x-y/y,x-y/x
6X+5y=100 x=?y=?
{x=5y 3x+6y=42
5x=6y x比y=?
x+2y=5x-6y=11