(3x-30)：(4x-30)=1:

60％x+25=40 x+30％x=52 19-120％x=7 4分之3x-5％x=17.5 x-10％x=18 （1-25％）x=36 2x+30％x=9.2 几道课外数学题(x^2+4x+8)^2+3x(x^2+4x+8)+2x^2(x^2+x+1)(x^2+x+2)-12(x-3)(x-1)(x+2)(x+4)+24若9x^2-30x+A^2是一个完全平方,则A=_____abx^2-(ac-b^2)x-bc=(ax______)(bx_______) 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 计算：(x+1)x=7 (x-1)(x+2)=30 (3-x)(3-x)+x=9 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 x^-4分之x^-3x加1=x+2分之30解方程 解方程:x/4=30% 36/x=3/4 10/x=2.5/0.8 x/4=1.2/5 X/1.2=1.5/0.6 x/0.4=1.5/6 x/7=0.6/3.5 x/10=0.1/25-3x=8x+1 2(x-2)+2=x+1 3-x=2-5(x-1) 3x=5(32-x) 7(4-x)=9(x-4) 7x-8=2x+27 5x-18=3-2x (7x-4)+3(x-2)=2x+6 2(3x-4)+(4-x)=4x我是六年级的学生,我希望 1:f(x)=4^x+2^(x+1)-32:f(x)=2^(x^2-2x)-13:f(x)=x^3-4x^2-11x+30 12—120％X=6 5分之3X—5％X=5.5 （1+25％）X=7.5 X—30％X=91 4％X+6％X=29.4 X+25％X=8.75 *-----------------------------------------------*| 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 || (x-3/x-2)-(x-2/x-1)=(x-5/x4) -(x-4/x-3) 解下列方程2x²+1=3x （x-3）²+4x（x-30=0 x(x+1)+(x+2)+(x+3)+(x+4)+(x+5) = 27求x (16x-13)/(4x-3)-(20x-24)/(4x-5)=(32x-30)/(8x-7)-(40x-43)/(8x-9)求x 60x（x-4)=30x 3X+30+X+X-15=? x+35=(x+3x)*30%