2x+{3X(12.5-x)}=30MEIYOU

2x+{3X(12.5-x)}=30MEIYOU x-2/3x+x+2/7x=30 (X+1)X(X+2)X(X+3)=504 一个“整式的乘法”的问题请先阅读下列解题过程,再仿做下面的问题.已知X*X + X - 1=0,求X*X*X + 2*X*X + 3的值.解X*X*X + 2X*X +3=X*X*X +X*X -X +X*X +X +3=X{X*X +X -1} +X*X +X -1 +4=0+0+4=4+ x + X*X + X*X*X=0.+ X*X + X*X*X x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少? x-2/5x-(x-2/5x)2/3-(2/5x-1/3x)=30求x (x^2-3x+1) (x^2+3x+2)( x^2-9x+20)= -30求X 计算：(x+1)x=7 (x-1)(x+2)=30 (3-x)(3-x)+x=9 10X-3=9 6X-7=4X-5 1/2X-6=3/4X 急 HELP ME ..help me已知2x+3x-1=y-x-8=x+6,求2x-y的植 已知x+1/x=3(x>0)求x的三分之二次方+x的负三分之二次方help me! *-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X || 初3数学,7道计算题! Help Me(1)4x^2+12x+9=81(2)x^2-7x-1=0(3)2x^2+3x=3(4)x^2-2x+1=25(5)x(2x-5)=4x-10(6)x^2+5x+7=3x+11 (x-3/x-2)-(x-2/x-1)=(x-5/x4) -(x-4/x-3) 解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6) x(x-2)-2x(x+1)-3x(x-5) 其中x=负½ x-2x+3x-4x+5x.+99x-100x=25求解 x+3x+x-2+x+x+50%x=188 求x