30%x +30 - (x-30%x-30)/4 =100怎么解?能细就细

3X+30+X+X-15=? x+35=(x+3x)*30% (x+30)*(x-18)=x*x x-(30-x)=(30-x)-x/3,怎么解 x+3x-(9x+30x)=98 x-2/3x+x+2/7x=30 求x^2-3x/x^2-6x+9*x^2-11x+30/x^2-5x-1 x^3+x-30(分解因式);x^12-y^12;x^15+x^14+x^13.x^2+x+1 30+(-x)²+6x(x+2)>-x(2x+3)+(-3x)² 解不等式 1/x(x+3)+1/(x+3)(x+6)+---+1/(x+27)(x+30） 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 30/x=30/(x-1.5)-x (x+2)(x-3)>0这个不等式的解集是不等式组x+2>0 与 x+20 x-30}={x/x>3}.{x/{x+2 (16x-13)/(4x-3)-(20x-24)/(4x-5)=(32x-30)/(8x-7)-(40x-43)/(8x-9)求x x-[2/5x+(x-2/5x-36)*2/3+36]=30 求x x-30-0.2x=0.5x