作业帮x^2-y^2=12,x+y=6.求x、y的值
来源：学生作业帮助网 编辑：作业帮 时间：2024/07/06 22:08:54
x)3ҭ354ҩЮ5{qCcY-O$T_`gCI`PFn&Lz1(a ~|]
&: !<;6`';XtOӵ>eӝMtkϺ۞uL@Tl^]r*X? Ov/~ںݦdG X|E-C4
t2
x^2-y^2=12,x+y=6.求x、y的值
x^2-y^2=12,x+y=6.求x、y的值
x^2-y^2=12,x+y=6.求x、y的值
x^2-y^2=12
(x+y)(x-y)=12
x+y=6
则x-y=2
解出 x=4,y=2
前一个式子可由平方差公式拆成(x+y)(x-y)=12,
把后面的式子x+y=6代入(x+y)(x-y)=12,
得x-y=2,与x+y=6连立方程组
最后x=4,y=2
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
x^2-y^2=12,x+y=6.求x、y的值
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
已知x-y=3,求[（x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值
已知3x =2y 求x/x+y+y/x-y-y²/x²-y²
已知x+y=a,2x-y=-2a,求[（x/y-y/x)/(x+y)-x(1/x-1/y)]/[(x+1)/y]的值
若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值
x+2y=2x+y+1=7x-y 求：2x-y?
x^2+y^2=15,x+y=7,x＞y,求x-y
如果|X|=4 |Y|=2 且|X+Y|=X+Y 求X+Y
已知|x|=2,|y|=3,|x+y|=-(x+y)求x-y
f(x+y,x-y)=(x^2-y^2)/2xy,求f(x,y)!
求(X+Y)(X-Y)(X²+Y²),X=5 Y=2,
y=3(x-y),x=2(x-y)求x,y的值
f(x+y,y/x)=x^2-y^2求f(x,y)
已知x≠y,x^2-x=y^2-y,求x+y的值.
f(x+y,y/x)=x^2-y^2,求f(x,y),详见里面
x+x+x-y-y=12 y+y+y-x-x=2 求x=?y=?奥数解法