x方减3x减4等于0
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x²+3x-1=0x²=-3x+1所以x³=x×x²=x(-3x+1)=-3x²+x=-3(-3x+1)+x=10x-3原式=(10x-3)+5(-3
X^3-X-49=0实数解x=(49/2+((49/2)^2+(-1/3)^3)^(1/2))^(1/3)+(49/2-((49/2)^2+(-1/3)^3)^(1/2))^(1/3)≈3.75037
笨笨的解法:x^2+2x-3=0(x+3)(x-1)=0可得x=1,-33x^2+6x-4=?13+6-4=5-327-18-4=5另一种解法:x^2+2x-3=0集体乘33x^2+6x-9=03x^
因为x²+3x-1=0所以x^3+4x²+2x+18=x^3+3x²-x+x²+3x+18=x(x²+3x-1)+x²+3x+18=x
3x^2-2x-8=(3x-4)(x+2)
x×x×x-3×x×x=0x×x²-3×x²=0x×x²=3×x²x×x²÷x²=3×x²÷x²x=3
x^2-4x+3=0(x-1)(x-3)=0所以x=1或3所以x1=1,x2=3
x^2-3x+1=0x^2=3x-1x^2+1=3xX的4次方+X的方+1分之X的方=x^2/[(x^2+1)^2-x^2]=x^2/(9x^2-x^2)=1/8
再答:采纳一下,好吗?谢谢了再问:那x的平方加负3分之11加2等于0了再答:采纳一下再答:
x^2-3x=130x^2-3x-130=0(x-13)(x+10)=0x=13或x=-10
x^3+4x^2-4x-16=0(x^3+4x^2)-(4x+16)=0x^2*(x+4)-4(x+4)=0(x+4)(x^2-4)=0(x+4)(x+2)(x-2)=0x1=-4x2=-2x3=2
x的平方-4分之3x=0x(x-4分之3)=0x=0或者x-4分之3=0解得:x=0或者x=4分之3再问:哦
再问:x²(x+2)=1能求出吗?再答:-1再问:我查了,4个解
1)3X^2-12X=-12;3X^2-12X+12=0;X^2-4X+4=0;(X-2)^2=0;故X1=X2=2.2)4X^2-144=0;X^2-36=0;(X+6)(X-6)=0;X1=-6,
(x^2+y^2)*(x^2-1+y^2)-12=0可以设x^2+y^2=z那么有z(z-1)=12z^2-z-12=0(z-4)(z+3)=0z=4或z=-3但z是平方和一定大于0所以z=4记得采纳
6x²-5x-21=0(2x+3)(3x-7)=02x+3=03x-7=0∴x1=-3/2x2=7/3
x²-4x+3=0(x-1)(x-3)=0x-1=0x-3=0x1=1x2=3