x减去0.74x=39-搜答案-搜狗做题网

(x+2)/(x-2)-1=3/(x²-4)(x+2-x+2)/(x-2)=3/(x-2)(x+2)(x≠2)4=3/(x+2)4x+8=34x=-5x=-5/4你的题目不够清晰

x/(y-x)

5/6

f(x)+f(-x)=lg[√(x²+1)-x]+lg[√(x²+1)+x]=lg[√(x²+1)-x][√(x²+1)+x]=lg(x²+1-x&#

x+1分之x+2减去x+3分之x+4=x+5分之x+6减去X+7分之x+8方程两边分别通分,得[(x+2)(x+3)-(x+1)(x+4)]/[(x+1)(x+3)]=[(x+6)(x+7)-(x+8

4（x+y)-3(x-y)=14x+7y=14(x+y)/2+(x-y)/3=6两边同乘以6,得3(x+y)+2(x-y)=365x+y=36则x+7(36-5x)=14x=7,y=1

因为被开方数要大于等于0所以99-X≥0X≤99所以√(99-X)-|X-101|=√(99-X)-[-(X-101)=√(99-X)+X-101所以X=√(99-X)+X-101√(99-X)=10

x分之2减去x+1分之x=1两边同乘以x（x＋1）,得2（x＋1）-x²=x（x＋1）2x²-x-2=0

X减去40等于多少

x-40

x减去8分之3x=12

再问：设x为1？再答：x=1x啊，这里的系数1省略了再问：ok谢谢了啊再答：~~

x²-x=-2x²-x+2=0b²-4ac=1-8＜0∴原方程无实数解

|x^3|=-x^3(-x^3-x)/x=-x^2-1

x^2-3|x|-4=0若x>=0.|x|=xx^2-3x-4=0(x-4)(x+1)=0x=4,x=-1其中x=-1不符合x>=0,舍去若x

x/(x+2)-(x+2)/(x-2)=8/(x^2-4)x(x-2)-(x+2)^2=8x^2-2x-x^2-4x-4=8-6x=12x=-2

x+4=3x=7

x^2-2x-3=(x+1)(x-3)2x^2-x-1=(2x+1)(x-1)x^2+3x-4=(x-1)(x+4)3x^2-8x-3=(3x+1)(x-3)

等于x(x-1)

由X²-X-1=0,两边同时除以X,得X-1-X/1=0,则X-X/1=1两边平方得X²+1/X²=1上面的式子再两边平方,就得到x的4次方+x4次方分之一的值是1啦~

1.x+1分之x-1减去x²-1分之4=x+1分之x+2(x-1)/(x+1)-4/(x²-1)=(x+2)/(x+1)同时乘以x²-1得(x-1)²-4=(x