3x-2y=10,x+y=11

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3x-2y=10,x+y=11
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai

(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=4x-2y-z-5x[6y-(x+y)]+x-(3y-10z)=4x-2y-z-30xy+5x²+5xy+x-3

x+y−2z=52x−y+z=42x+y−3z=10

方程(1)+(2)得:3x-z=9④,方程(2)+(3)得:2x-z=7⑤,④-⑤得:x=2,把它代入⑤得:z=-3,把它代入(1)得:y=-3,∴原方程的解为x=2y=−3z=−3.

(3xy)平方/(-xy)+(x-2y)平方-(x+2y)(x-2y)=

(3xy)平方/(-xy)+(x-2y)平方-(x+2y)(x-2y)=-9xy+(x-2y)(x-2y-x-2y)=-9xy+(x-2y)(-4y)=-9xy-4xy+8y²=8y

化简并求值:(x+2y)(2x+y)-(3x-y)(x+2y),其中X=9,Y=二分之一

(x+2y)(2x+y)-(3x-y)(x+2y)=(2x^2+5xy+2y^2)-(3x^2+5xy-2y^2)=4y^2-x^2=1-81=-80

根据下列条件分别求代数式4(x-y)+5 (x-y)-11(x-y)得值; 1、x=3,y=1;2

答案马上送达再问:可以说了吧!再答:1,、x=3,y=14(3-1)+5(3-1)-11(3-1)=(4+5-11)(3-1)=-2*2=-42、x=0,y=-2x-y=0-(-2)=24+5-11=

已知x,y为实数,且2(x+2y)=x²+y²+5求代数式3x-4y分之x²+y²

2(x+2y)=x²+y²+5整理得(x-1)^2+(y-2)^2=0x=1,y=2(x²+y²)/(3x-4y)=-1

3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27

化简得:-x+7y=11①7x+3y=27②①式×7得:-7x+49y=77③②+③得:52y=104∴y=2代入①得:x=3∴x=3,y=2再问:亲,是代入法哦!再答:代入法①式得3x+3y-4x+

计算(x+y)(x+y)^2(-x-y)^3

(x+y)(x+y)^2(-x-y)^3=-(x+y)^6

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&

数学(x-y)^5*(y-x)^3*(x-y)^2

(x-y)^5*(y-x)^3*(x-y)^2=-(x-y)^5*(x-y)^3*(x-y)^2=-(x-y)^(5+3+2)=-(x-y)^10

化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方

(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方=x²-2xy-3y²-x²+4y²-x²+2xy-y²=(x²-

3x+4y+10=3.5(x+y+2) 0+2+14+3x+4y=2.5(10+x+y)

3x-3.5x+4y-3.5y+10-3.5*2=016+3x+4y-25-2.5x-2.5y=0-0.5x+0.5y+3=00.5x+1.5y-9=0上面两式相加2y-6=0y=30.5x+3*1.

[(3x+y)(x-y)-(2x+3y)(x-y)]*(x-y)

=(x-y)[(3x+y)-(2x+3y)]*(x-y)=(x-y)*(x-y)(3x+y-2x-3y)=(x-y)(x-y)(x-2y)到底是化简,还是?=(x*x-2xy+y*y)(x-2y)=x

|x+y+2|+(2x+3y+5)²=0 求x y的值.

绝对值加平方=0因为两者均大于等于0所以都是0|x+y+2|=0(2x+3y+5)²=0x+y=-22x+3y=-5x=-1y=-1有什么不明白可以继续问,随时在线等.

【x-3y][x+y]-[x-2y][x +2y]-[x-y

解题思路:根据题意,由整式的运算的知识整理,分析可以求得解题过程:

有这样一道题:"计算(2*x*x*x-3*x*x*y-2*x*y*y)-(x*x*x-2*x*y*y+y*y*y)+【-

解代数式得:-3x的平方y-2y的三次方因为1/2的平方=-1/2的平方,所以结果仍正确给分吧!嘿嘿!

已知方程组2x-y=10,x+2y=11,求(2x-y)³-(2x-y)²(x-3y)的值

(2x-y)³-(2x-y)²(x-3y)=(2x-y)²[(2x-y)-(x-3y)]=(2x-y)²(x+2y)=10²×11=1100

关于x、y的方程组3x+2y=m+14x+y=m

3x+2y=m+1①4x+y=m②①-②×2得:-5x=-m+1,解得:x=m−15,①×4-②×3得:5y=m+1,解得:y=m+15,即方程组的解是x=m−15y=m+15,∵关于x、y的方程组3

已知2x-y=10,求((x+y)-(x-y)+2y(x-y))÷4y的值

((x+y)-(x-y)+2y(x-y)=x+y-(x-2xy+y)+2xy-2y=2xy+2xy-2y=2y(2x-y)=2y×10=20y20y÷4y=5

已知x和y满足x+3y+|3x-y|=19,2x+y=6,求x,y的值

x+3y+|3x-y|=192x+y=6可知y=6-2x:代入上式可得x+3(6-2x)+|3x-(6-2x)|=19化简计算后可知:|5x-6|=1+5x可知5x-6=1+5x或5x-6=-(1+5