X=几?5X-4=40 5(X-4)=40 (48-3X)÷3=0 X+5X-7X=几?5X-4=40 5(X-4)=40 (48-3X)÷3=0X+5X-7=11

(x-1)(x-2)(x-3)(x-4)=(x+5)(x+6)(x+7)求X等于几? 4/x+5/x=1,那么x等于几? x+7=?4-x=?x-1=?5-x=?分别等于几? x-3分之2-4x+1分之5=1 等于几x等于几 5X=4X+2 等于几? 4-3(2-x)=5x 等于几 3x-5=4 x是几 (x+2)/x(x-2)-(x-1)/x²-4x+4=几, 几道分式方程的题解方程：1/(x-1)(X-2)=1/(X-4)(X-5)X/（X-1) -（X-1）/（X-2）=（x-3）/(x-4) - (x-4)/(X-5) x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少? 4x+x²=5.问,x等于几? 4x+x²=15.问,x等于几? 2x=4-x,x等于几 12X-4X^2=8 X为几 1+X+X^2+X^3+X^4=0,则1+X+X^2+X^3+X^4+X^5+X^6+……+X^99等于几 x平方+5x+6=(x+3)(x+几) (X-2/X-4)+(X平方-4X+4/4)除以(x-2/x) /=几分之几 几道多项式乘法题(x+2)(x+4)-x(x+1)-83(x-2)(x+1)-2(x-5)(x-3)x(x的平方-4)-(x+3)(x的平方-3x+2)先化简,再求值：（3x+2）（2x-3）-(2x-5)(3x-1),其中x=1/2.