x x-1=y的2次方 4y-2-搜答案-拍题作业网

x²+2x+2y+y²+2=0(x²+2x+1)+(y²+2y+1)=0(x+1)²+(y+1)²=0平方大于等于0,相加等于0,若有一个大

2的x次方=4的（y+1)次方=>2的x次方=2的2（y+1)次方=>x=2(y+1)27的y次方=3的（x-1）次方=>3的3y次方=3的（x-1）次方=>3y=x-1x=4,y=1x-y=3再问：

(x-y)(z+y-x+y+2y)÷4y=(x-y)(z-x+4y)÷4y{(x+y)(x-y)-(x-y)的2次方+2y(x-y)}除以4y=(x-y)(x+y-x+y+2y)÷4y=(x-y)(4

有任何不理解的地方,欢迎追问,/

4的y次方=2^(2y)设2y=mx+m=12^x+2^m就是均值不等式了最小值是2√2

x=-4y=34y次方-2x次方+3次方=63.5

2(x-y)-(x-3y)=1/22x-2y-x+3y=1/2∴x+y=1/24的x次方×2的y次方×2的y次方-2×2的2x次方×2的2y次方=2的2x次方×2的2y次方-2×2的2x次方×2的2y

原式=(x+y)(x-x+y)-y^2=y(x+y)-y^2=y(x+y-y)=yx=4^2011×(1/4)^2010=(4×1/4)^2010×4=4

解原式=(x^2+y^2)-(xy)^2=(x^2+xy+y^2)(x^2-xy+y^2)

(-y)2次方乘y的n-1=

=y2次方乘y的n-1=y的2+n-1次方=y的n+1次方

y的6次方

3的2x+3y+3次方=1即2x+3y+3=02x+3y=-3所以4的x次方×8的y次方=2的2x次方×2的3y次方=2的(2x+3y)次方=2的-3次方=1/8

xx+yy+4x-6y+13=0整理得：(x+2)^2+(y-3)^2=0那么只有(x+2)=0(y-3)=0x=-2y=3(x^2-2x)/(x^2+3y^2)=(4+4)/(4+3*9)=8/31

4的y+1次方=2的2(y+1)次方27的y次方=3的3y次方x=2(y+1)3y=x-1x=4,y=1

x^2+x-x^2-y=3x-y=3(x-y)^2=9x^2+y^2-2xy=9(x^2+y^2)/2-xy=9/2

晕~想想x=2,y=-3

由题意得：2y+2=x,6y=x+2.解得：x=4,y=1.

XX+YY+4X-6Y+13=0(X+2)²+(Y-3)²=0X+2=0Y-3=0X=-2Y=3X的Y次方=-8

x(x+1)-(xx+y)=-3x^2+x-x^2-y=-3x-y=-3(xx+yy)/2-xy=(x^2+y^2-2xy)/2=(x-y)^2/2=(-3)^2/2=9/2再问：是对的吧！再答：当然