y=(x+1)²

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y=(x+1)²
等式|x−y|=(x+y)

|x-y|=(x−y)2=(x+y)2−4xy.故答案为-4xy.

已知x,y满足y=x

依题意,得:x2−16≥016−x2≥0,8-2x≠0;即x2-16=0,8-2x≠0;由x2-16=0,得:x=±4;由8-2x≠0,得x≠4;综上知:x=-4;y=−98−2×(−4)=-916;

1、(x-2y)(x+y)

原式=x^2-xy-2xy-2y^2=2x^2-3xy-2y^22、是的,你算错了,以后要细心!原式=(a^2+4ab+4b^2)(2a+b^2)=2a^3+a^2b^2+8a^2b+4ab^3+8a

已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.

已知x-y=1,则y=x-1,x=y+1{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y=(x²+4xy+4y²+2x²+9xy+4y&

1、x(x-y)(x+y)-x(x+y)^2

1)x(x-y)(x+y)-x(x+y)^2=x((x-y)(x+y)-(x+y)^2)=x(x^2-y^2-x^2-2xy-y^2)=x(-2xy-2y^2)=-2xy(x+y)2)(2a+b)(2

【(X²+Y²)-(X-Y)²+2Y(X-Y)】/4Y=1,求4X/4X²-Y&

【(X²+Y²)-(X-Y)²+2Y(X-Y)】/4Y=1,【2xy+2Y(X-Y)】/4Y=14x-2y=42x-y=24X/(4X²-Y²)-1/

函数y=1+x

y=1+x23−x2则y(3-x2)=1+x2∴x2=3y−1y+1≥0解得y∈(−∞,−1)∪[13,+∞)故答案为:(−∞,−1)∪[13,+∞)

1、y-x/x²-y²

11/x+y2-1

[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y

[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y=[x²-y²-x²-2xy-y²-xy+xy²]/(y/2)=[(x-2)y

(1)(x+y)^2-(x-y)^2

1)4xy2)-1/5y^23)2ab^2c4)(2a+b)^25)2yz+xz6)-3a-57)4xy

求函数y=x+1x

当x>0时y=x+1x≥2x•1x=2,当且仅当x=1取等号,当x<0时y=-(-x-1x)≤-2(−x)•1(−x)=-2,当且仅当x=1取等号,∴函数y=x+1x的值域为(-∞,-2]∪[2,+∞

已知x+y=0,x+13y=1,求x²+12xy+13y²的值.

解题思路::∵x+y=0,x+13y=1,解得x=1/12,y=-1/12∴x²+12xy+13y²=1/144-1/12+13/144=14/144-1/12=2/144=1/72解题过程:已知x+

(1)(x^2/x)-y-x-y

(1)x^2/x)-y-x-y=x-y-x-y=-2y(2)(a/a-b)-(a/a+b)-(2b^2/a^2-b^2)=a(a+b-a+b)/(a^2-b^2)-(2b^2/a^2-b^2)=2b/

已知实数x,y满足x−x+1=y+3−y

∵x−x+1=y+3−y,∴x+y=x+1+y+3≤2x+y+42则(x+y)2≤2(x+y+4)解得:-2≤x+y≤4∴x+y的最大值为4故答案为:4

y=5;x=14;y=((x=3*y,x+6),x-1); printf(''x=%d,y=%d'

=exp1,exp2------r=exp2逗号表达式从左往右执行,但返回的最后1个式子的值所以:y=((x=3*y,x+6),x-1);-->y=(x=x+6,x-1)-->y=(x=20,13)-

若方程组x+2y=m2x+y=1

根据题意联立得:2x+y=1①x−y=5②,①+②得:3x=6,即x=2,①-②×2得:3y=-9,即y=-3,将x=2,y=-3代入x+2y=m得:m=2-6=-4,故答案为:-4.

函数y=x+1x

函数f(x)=x+1x在区间(0,1)上单调递减,在区间(1,+∞)上单调递增∴函数f(x)最大值在端点取得,最小值在x=1处取得又∵f(2)=52,f(12)=52,f(1)=2∴函数f(x)=x+

将x(x+y)(x-y)-x(x+y)2进行因式分解,并求当x+y=1,xy=−12

x(x+y)(x-y)-x(x+y)2=x(x+y)[(x-y)-(x+y)]=-2xy(x+y).当x+y=1,xy=-12时,原式=-2×(-12)×1=1.

1 ,化简 (x-y)(x+y)

(x-y)(x+y)=x²-y²(x+3)²=x²+6x+9(x-1)(x-2)=x²-3x+2√25=5