(x+3)(y-5)=(x-2)(y+7)的解?
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(x+3)(y-5)=(x-2)(y+7)的解?
(x+3)(y-5)=(x-2)(y+7)的解?
(x+3)(y-5)=(x-2)(y+7)的解?
(x+3)(y-5)=(x-2)(y+7)
xy-5x+3y-15=xy+7x-2y-14
-12x+5y-1=0
12x-5y+1=0
所以只要带入一个x的值,就可得到一个y值
有无数组解
如 x=0 y=1/5
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
3x+5y-(x+y)=6 2(x+y)-3x=-7
x+y=1 5x-2y=8 3x-y=7 2x-y=3x表示y和用y表示x
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=
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
{6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1
化简:3(x-y)²-7(x-y)+ 2(x-y)²+5(x-y)
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)
4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
x-y/7 - x+y/10 =1/2 2(x-y)-5(x+y)=3修改、、、、(x-y)/7-(x+y)/10=1/2 2(x-y)-5(x+y)=3
把(x-y)看做一个整体,合并同类项5(x-y)+2(x-y)-4(x-y)=3(x-y)次方-4(x-y)+7(x-y)-6(x-y)次方=
计算(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-x^y^7+y^8)(x^2+xy+y^2)
{2x+y/3-2y=0 2(2x+y)-5=7y