(√x 3y)÷√10-2x等于多少

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若-3小于等于x大于等于2时,试化简:|x-2|+√(x+3)(x+3)+√(x方-10x+25) √

原式=|x-2|+|x+3|+√(x-5)平方=|x-2|+|x+3|+|x-5|=2-x+3+5-x=10-2x

计算:[x(x2y2-xy)-y(x2+x3y)]÷3x2y.

[x(x2y2-xy)-y(x2+x3y)]÷3x2y,=(x3y2-x2y-x2y-x3y2)÷3x2y,=-2x2y÷3x2y,=-23.

把下列各式分解因式:(1)x3y-xy3;(2)(x2+1)2-4x2;(3)先化简再求值,x−yx÷(x−2xy−y

(1)原式=xy(x2-y2)=xy(x+y)(x-y);(2)原式=(x2+1-2x)(x2+1+2x)=(x-1)2(x+1)2;(3)原式=x−yx÷(x−y)2x=x−yx×x(x−y)2=1

已知x+y=5,x2+y2=13,求代数式x3y+2x2y2+xy3的值.

x3y+2x2y2+xy3=xy(x2+2xy+y2)=xy(x+y)2,∵x+y=5,∴(x+y)2=25,x2+y2+2xy=25,∵x2+y2=13,∴xy=6,∴xy(x+y)2=6×25=1

计算:(2x3y)

原式=4x29y2•27y364x3•4xy=34x2.故答案为34x2.

已知x+y=4,x2+y2=14,求x3y-2x2y2+xy3的值.

∵x+y=4,∴(x+y)2=16,∴x2+y2+2xy=16,而x2+y2=14,∴xy=1,∴x3y-2x2y2+xy3=xy(x2-2xy+y2)=14-2=12.

若x+y=-1,则x4+5x3y+x2y+8x2y2+xy2+5xy3+y4的值等于(  )

原式=x4+x3y+4x3y+x2y+4x2y2+4x2y2+xy2+4xy3+xy3+y4,=x3(x+y)+4x2y(x+y)+xy(x+y)+4xy2(x+y)+y3(x+y),=-x3-4x2

有这样一道题,计算(2x4-4x3y-x2y2)-2(x4-2x3y-y3)+x2y2的值,其中x=0.25,y=-1;

(2x4-4x3y-x2y2)-2(x4-2x3y-y3)+x2y2=2x4-4x3y-x2y2-2x4+4x3y+2y3+x2y2=2y3,因为化简的结果中不含x,所以原式的值与x值无关.

若x+y=1则代数式x4+6x3y—2x2y+10x2y2—2xy2+6xy3+y4的值等于_____

原式=(x^4-2x²y²+y^4)+6xy(x²+2xy+y²)-2xy(x+y)=(x²-y²)²+6xy(x+y)²

计算:[x(x2y2-xy)-y(x2-x3y)]÷3x2y.

原式=(x3y2-x2y-x2y+x3y2)÷3x2y=(2x3y2-2x2y)÷3x2y=23xy-23.

已知x+y=5,xy=3,求代数式x3y-2x平方y平方+xy3

已知x+y=5,xy=3,代数式x3y-2x平方y平方+xy3=xy(x²-2xy+y²)=xy(x-y)²=3×[(x+y)²-4xy]=3×(25-12)=

若x-y=6,xy=17/36,则代数式X3y-2x2y2=xy3的值为__ X后面的数字为X的平方

应该是X3y-2x2y2+xy3原式=x3y-2x2y2+xy3=xy(x2-2xy+y2)=xy(x-y)2=17/36*6=17麻烦采纳,谢谢!

已知x+y=4,xy=2,则x3y+x2y2+xy3的值:

x+y=4,xy=2后者平方后二式相加再加后者平方

已知x=√3-√2,y=√3+√2,求x3y+xy3

x3y+xy3=xy(x^2+y^2)=(√3-√2)(√3+√2)((√3-√2)^2)+(√3-√2)^2)=1*(3-2√6+2+3+2√6+2)=10

计算(1)(x+2y-3)(x-2y+3);   (2)(2x3y)2•(-2xy)+(-2x3y)

(1)原式=x2-(2y-3)2=x2-4y2+12y-9;(2)原式=4x6y2•(-2xy)-8x9y3÷(2x2)=-8x7y3-4x7y3=-12x7y3.

化简求值:[x(x2y2-xy)-y(x2-x3y)]÷3x2y,其中x=3,y=-1.

原式=[x3y2-x2y-x2y+x3y2]÷3x2y=(2x3y2-2x2y)÷3x2y=23xy-23;当x=3,y=-1时,原式=23×3×(-1)-23=-83.

已知x-y=l,xy=2,求x3y-2x2y2+xy3的值.

∵x-y=l,xy=2,∴x3y-2x2y2+xy3=xy(x2-2xy+y2)=xy(x-y)2=2×1=2.

研究下列二元一次方程组的解的情况2X+3Y=6,2X-3Y=6.2X+3Y=6,2X+3Y=8.2X3Y=6,4X+6y

a1=a2,b1=-b2,c1=c2a1=a2,b1=b2,c1不等于c2a1不等于a2,b1不等于b2,c1不等于c2

已知关于x,y的方程组2x3y=-k+2,3x-2y=5k+3的解x,y的值满足x-y=5,求k的值.最后答案是k=2.

2x+3y=-k+2,①3x-2y=5k+3②2*①+3*②13x=13k+13所以x=k+1代入①y=-kx-y=2k+1=5k=2