6x^2-120x-5=0
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1,(1)将(x+3/x-1)设为a(2)得a²-5a+6=0(3)因式分解(a-2)(a-3)=0(4)a1=2a2=32,化简得x³-4x²+18=0
4/(x-2)+(x-1)/[(x-2)(x-3)]-2/(x-3)=0[4(x-3)+(x-1)-2(x-2)]/[(x-2)(x-3)]=03(x-3)/[(x-2)(x-3)]=0不知道解了~~
设a=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)那么y=a*(x-10);那么y^=a^*(x-10)+a*(x-10)^=a^*(x-10)+a那么y
x(1+2+...+9)=x(9-8-7-...-1)x=0记得采纳啊
2x+3x+4x+5x+x+6x+7x=10028x=100x=100/28x=25/7
6/x+1=x-5/x^2+x6/x+1=x-5/x(x+1)两边同乘x(x+1)6x=x-5x=-1但是x(x+1)≠0x≠0或-1所以该方程无解
x+x^2+x^3+x^4+x^5+x^6+x^7+x^8=(x+x^2+x^3+x^4)+(x^5+x^6+x^7+x^8)=x(1+x+x^2+x^3)+x^5(1+x+x^2+x^3)=(x+x
6x^3+7x^2-13x+11=6x^3+3x^2-15x+4x^2+2x-10+21=3x(2x*x+x-5)+2(2x*x+x-5)+21=3x*0+2*0+21=21
1、X²-2X-8=0x²-2x+1-9=0x²-2x+1=9(x-1)²=9x-1=±3x1=4,x2=-22、X²+6X=-9x²+6x
由2x6x-4=0得x=1/2,再将x=1/2代入得(3-x/2x^2-4x)/(5/x-2-x-x)=5/14
1+x+x^2+x^3=0x+x^2+x^3+x^4+x^5+x^6+x^7+x^8=(x+x^2+x^3+x^4)+(x^5+x^6+x^7+x^8)=x(1+x+x^2+x^3)+x^5(1+x+
x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6)x/(x-2)=2x/(x-3)+(1-x)/(x-2)(x-3)x(x-3)/(x-2)(x-3)=2x(x-2)/(x-2)(x-3)
有种方法叫做穿针引线法,需要在纸上画出函数的简图,这个题的答案应该是-2,3,6,1
(x^3+x^2)+(x^2-5x-6)=x^2*(x+1)+(x+1)(x-6)=(x+1)(x^2+x-6)(x+1)(x+3)(x-2)=0所以,它的解有:x=-1,x=-3,x=2
(1)2x^3-6x^2-3x+9=02x^2(x-3)-3(x-3)=0(2x^2-3)(x-3)解得:x1=3/2,x2=根号6/2,x3=-根号6/2(2)X^3-3x-2=0x^3-2x^2+
3x(x-5)≤(2x-9)(x-5)3x^2-15x≤2x^2-19x+45x^2+4x-45≤0(x+9)(x-5)≤0-9≤x≤5A={-9≤x≤5}2x^2-x-6>0(2x+3)(x-2)>
x(x*x-1)+x(5-x*x)-6y+7=-x+5x-6y+7=2(2x-3y)+7=2*(-4)+7=-8+7=-1再问:能在写详一点吗-x+5x-6y+7再答:x(x*x-1)+x(5-x*x
要过程还是答案
1,应该是x是几次幂就有几个根吧,所以应该是7+2=9个2.-7.036622145,-6.489288572,-6.200988153,-4.734373320,-4.289168546,-2.77
x^2+5x-990=0,两边同乘x,得x^3+5x^2-990x=0,加上原式,得x^3+6x^2-985x-990=0,则x^3+6x^2-985x+2010=0+990+2010=3000希望采