5x+2=8x

(x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2=x^2+10x-24+x^2+15x+56-x^2+5x+50=x^2+30x+82=4+60+82=146其实,不化简,直接代入=14*0+9*10+7*8

x+2/x+1-x+4/x+3=x+6/x+5-x+8/x+7x=?x+2/x+1-x+4/x+3=x+6/x+5-x+8/x+71+1/(x+1)-1-1/(x+3)=1+1/x+5)-1-1/(x+7)1/(x+1)+1/(x+7)=1

x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?x(1+2+...+9)=x(9-8-7-...-1)x=0记得采纳啊

(5x-2)*(x+8)=5x*x+98(5x-2)(x+8)=5x²+985x²+38x-16=5x²+9838x=114x=3(5x-2)*(x+8)=5x*x+985X^2+40X-2X-16=5X^2+

8x+3(x-2)=5x+(x-3)8x+3x-6=5x+x-311x-6x=35x=3x=3/5

X-5+8*X=7*X-2*X-1变形得9X—5=5X—1得4X=4得X=1x=1①50(x+0.2)=60(x-1),50x+10=60x-60,10x=70,x=7.②50(x-2+8)=(50+10)(x-2-7),50(x+6)=6

x-8/x-4=2-x-5/x-7每个分式减去1(x-4-x+5)/(x-5)+(x-8-x+9)/(x-9)=(x-7-x+8)/(x-8)+(x-5-x+6)/(x-6)1/(x-5)+1/(x-9)=1/(x-8)+1/(x-6)通分

已知A={x|x*x-ax+a*a-19},B={x|x*x-5x+8=2},C={x|x*x+2x-8=0}.若空集真包含于A交B,且A交C=空集,求a的值a=-2因为空集真包含于A交B,A交C=空集所以A交B={3}把x=3代入x方-a

已知1+x+x^2+x^3=0,求x+x^2+x^3+x^4+x^5+x^6+x^7+x^8的值不是的话是多少?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）=

1)1+x+x^2=0,求1+x+x^2+x^3+x^4+x^5+x^6+x^7+x^8+x^10的值2)1+x+x^2=0,求1+x+x^2+x^3+……+x^20的值（1）原式=(1+x+x^2)+x^3(1+x+x^2)+x^6(1+

如果1+x+x^2+x^3=0,求x+x^2+X^3+x^4+x^5+x^6+x^7+x^8的值,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)=01+x+x^2+

1+x+x^2+x^3+x^4+x^5+x^6+x^7+x^8+x^9+x^10+x^11=17.7这个方程怎么样求解?这是等比数列,可以看做F(X)=(X)^(N-1)求和公式S(N)=1*（1-X^N）/(1-X)=17.7(n=11)

解方程:(x+3)/(x+2)-(x+5)/(x+4)=(x+7)/(x+6)-(x+9)/(x+8)写清楚一点(x+3)/(x+2)+(x+9)/(x+8)=(x+5)/(x+4)+(x+7)/(x+6)1+(x+5)/(x+2)(x+8

解方程x+2/x+1+x+8/x+7=x+6/x+5+x+4/x+3首先由题意得x+1≠0,x+7≠0,x+5≠0,x+3≠0,即x≠-1,x≠-7,x≠-5,x≠-3,则先简化方程(x+1+1)/(x+1)+(x+7+1)/(x+7)=(

解方程:(x+3)/(x+2)-(x+5)/(x+4)=(x+7)/(x+6)-(x+9)/(x+8)2011-03-16|分享

因式分解x^8+x^7+x^6+x^5+x^4+x^3+x^2+x=?原式=x^5(x^3+x^2+x+1)+x(x^3+x^2+x+1)=x(x^4+1)(x^3+x^2+x+1)=x(x^4+1)[x^2(x+1)+(x+1)]=x(x

x-2/x-1+x-8/x-7=x-4/x-3+x-6/x-5作为方程好像没法解,两边就约去了

(X+2)/(X+1)-(X+4)/(X+3)=(X+6)/(X+5)-(X+8)/(X+7)(X+2)/(X+1)-(X+4)/(X+3)=(X+6)/(X+5)-(X+8)/(X+7)(X+1+1)/(X+1)-(X+3+1)/(X+3

解方程(x+2)/(x+1)-(x+4)/(x+3)=(x+6)/(x+5)-(x+8)/(x+7)x=-4把等式变形可得2+1/(x+1)+1/(x+7)=2+1/(x+5)+1/(x+3)2x+82x+8_________=______

x+2/x+1-x+4/x+3=x+6/x+5-x+8/x+7你的题目就是这样的么?每一项都是单项?没有括号什么的?