2.5×4+3x＝12.4 解方程-搜答案-智慧作业帮

(x²+y²-3)(2x²+2y²-4)=242(x²+y²-3)(x²+y²-2)=24(x²+y²

因为3x方+xy-2y方=0,即（x+y)(3x-2y)=0,而x+y≠0,所以3x-2y=0原式=[（x+y)^2-4xy]/[(x+3y)(x-y)/(x+3y)(x-3y)=(x-3y)/(x+

依次为：(x-3)(x+1)；(x+9)(x-2)；(x-4)(x+1)；(x+6)(x-1)；(x-4)(x-9)；(2x+1)(x+1)

1.

x^3-4x+3=0x^3-x-3x+3=0x(x^2-1)-3(x-1)=0x(x-1)(x+1)-3(x-1)=0(x-1)(x^2+x-3)=0x-1=0或x^2+x-3=0x=1或x=(-1±

∵x²+4x+3＞2x²+2x+7∴x²+4x+3-2x²-2X-7＞0-x²+2x-4＞0又∵a＜0∴图像开口向下△=b²-4ac=-12

4x方+x+2x根号下(3x方+x)=[x+根号下(3x方+x)]的平方=9x+根号下(3x方+x)=33x方+x=(3-x)的平方=9-6x+x方2x方+7x=9x=1

2x方-3x+2x根号x方-3x+4=212x^2-3x+2x√(x^2-3x+4)=21x^2-3x+4+2x√(x^2-3x+4)+x^2=25[√(x^2-3x+4)+x]^2=25√(x^2-

x四次方-3x三次方-8x平方+6x+4=0(x^4+x^3-2x^2)-4x^3-4x^2+8x-2x^2-2x+4=0x^2(x^2+x-2)-4x(x^2+x-2)-2(x^2+x-2)=0(x

X方-2x+1=9X方-2x-8=0(x-4)(x+2)=0x1=4,x2=-24X方+4X+1=2(2X+1)方=22x+1=根2或-根2x1=（根2-1）/2,x2=-（根2+1）/2五分之二X方

x(x-1)(x-2)³(x+1)(x-1)(x-1)(x²+x+1)/[(3-4x)(x²+x+2)]>0x(x-1)³(x-2)³(x+1)(x&

（3x-1）²-（3-2x）²=0（x+2）（5x-4）=0x1=-2,x2=4/5

把每个式子因式分解x的方+5x+4=（x+1）(x+4)x方-5x+6=(x-2)(x-3)………………

=[3x(x+1)/(x+1)(x²-x+1)]*[(x²+1)/(x²+1)(x²-1)]*(x-1)²/x]=[3x/(x²-x+1)]

8x^2-6y^2=146x^2+4y^2=3814x^2-2y^2=52

2x³+3x³-4x³=(2+3-4)x³=x³

X^7+X^6+X^5+X^4+X^3+X^2+X+1=X^6(X+1)+X^4(X+1)+X^2(X+1)+(X+1)=(X+1)(X^6+X^4+X^2+1)=(X+1)[(X^4(X^2+1)+

2X方+3X-4=5除以2X方+3x2x^2+3x-4=5/(2x^2+3x)设y=2x^2+3x,那么,y-4=5/yy^2-4y-5=0(y-5)(y+1)=0y1=5y2=-12x^2+3x=5

17x的9次方,上式为2x的9次方-64x的9次方+81x的9次方

3x的四次方-11x的二次方-4=0的解3x^4-11x^2-4=0(3x+1)(x-4)=0x=-1/3或者x=4