7(x-2)=2x+3

2x+3x+4x+5x+x+6x+7x=1002x+3x+4x+5x+x+6x+7x=10028x=100x=100/28x=25/727x=100x=100/27；；；；；；；；；；；速率可达粉色礼服螺丝钉解放isskl其实我不会2x+3

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

x-2/3x+x+2/7x=30x-2/3x+x+2/7x=30(1-2/3+1+2/7)x=30(34/21)x=30x=30÷34/21x=315/17

x(x+2)(x+3)(x+5)=7x(x+2)(x+3)(x+5)=7[x(x+5)][(x+2)(x+3)]=7(x²+5x)(x²+5x+6)-7=0(x²+5x)[(x²+5x)+6]-7=0

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）=

已知1+x+x^2+x^3=0,求x+x^2+x^3+x^4+x^+x^6+x^7+x^8的值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

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)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+

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)

(x+1)(x+2)(x+3)(x+4)-(x^2+5x+3)(x^2+5x+7)=?=[(x+1)(x+4)][(x+2)(x+3)]-[(x^2+5x)+3][(x^2+5x)+7]=[(x^2+5x)+4][(x^2+5x)+6]-[

解方程x+1\x+2+x+8\x+9=x+2\x+3+x+7\x+8(x+1)/(x+2)+(x+8)/(x+9)=(x+2)/(x+3)+(x+7)/(x+8)(x+2-1)/(x+2)+(x+9-1)/(x+9)=(x+3-1)/(x+

解方程(x+1/x+2)-(x+2/x+3)=(x+5/x+6)-(x+6/x+7)我给个思路吧（X+2-1/X+2)-(X+3-1/X+3)=（X+6-1/X+6)-(X+7-1/X+7)1-1/(X+2)-1+1/(X+3)=1-1/(

解方程：x+2/x+1-x+3/x+2=x+6/x+5-x+7/x+6通分化简得到(x+1)(x+2)=(x+5)(x+6)3x+2=11x+308x=-28x=-7/2解x+2/x+1-x+3/x+2=x+6/x+5-x+7/x+6同时乘

解分式方程：(x+1)/(x+2)+(x+6)/(x+7)=(x+2)/(x+3)+(x+5)/(x+6)(x+1)/(x+2)+(x+6)/(x+7)=(x+2)/(x+3)+(x+5)/(x+6)1-1/(x+2)+1-1/(x+7)=

x+2/x+3－x+1/x+2=x+8/x+9－x+7/x+8(x+2)/(x+3)-(x+1)/(x+2)=(x+8)/(x+9)-(x+7)/(x+8)(x+2)²/[(x+2)(x+3)]-(x+1)(x+3)/[(x+2)

解方程：（x+1)/(x+2)+（x+6)/(x+7)=(x+2)/(x+3)+(x+5)/(x+6),为什么必须使方程两边分母常数差相等?我的解法：原方程=（x+1)/(x+2)+(x+6)/(x+7)=(x+2)/(x+3)+(x+5)

x-1\x-2+x-6\x-7=x-2\x-3+x-5\x-6分式方程X-1/X-2-(X-2)/(X-3)=(X-5)/(X-6)-(X-6)/(X-7)(X-1)(X-3)-(X-2)²/（X-2）（x-3）=（X-5)(X-

(x-1)/(x-2)+(x-6)/(x-7)=(x-2)/(x-3)+(x-5)/(x-6)RT（x-1)/(x-2)-(x-2)/(x-3)=(x-5)/(x-6)-(x-6)/(x-7)(X2-4x+3-x2+4x-4)/(x-2)(

1.解方程(X+6)/(X+7)+(X+1)/(X+2)=(X+2)/(X+3)+(X+5)/(X+6)2.若方程(X-1)(X平方+8X-3)=0的三根分别是X1,X2,X3.那么X1X2+X2X3+X1X3的值是?3.若A/B=B/C=