120-3x=50-x

x+3x+x-2+x+x+50%x=188 求x 120-3x=50-x 3X-120%X=9/50 (x+x+23+x+50)=3x 怎么解 (x+1)+(x+2)+(X+3).+(x+50)=1325 证明(x+1)(X+3)(x+5)(x+7)+15=(X+8x)+22(x+8x)+120 (3x*x+3x*x+x*x)*2=120, x/50-3=x/60+2 （15+25/x）=120/10+x x+ x+(x*50%)=1.5X? 用递归法求y=x-(x*x*x/3!)+(x*x*x*x*x/5!)-(x*x*x*x*x*x*x/7!)+. X-X/12-X/7-X/8-X/4-X/20-X/5-30-120-300=50解方程 一元一次方程：x-100/50-2=x-100/60+5 x/120-x/130=2 6x+x-1/5+1=100 2x-1/3-10x+1/12=2x+1/4-1 求几道解方程数学题60%x+25=40 x+30%x=52 19-120%x=7 x-10%x=18 (1-25%)x=362x+30%x=9.260%x+90=102 x-20%=5.2 50%x+3x=28 9.1-14%x=0.7 (32-2x)x=120 (x+3)^2=-x(x+5) 两个方程 3x*x=1600+x*x-80x (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^2-5x)^2+10(x^2-5x)+24 =x^4-10x^3+25x^2+10x^2-50x+24 这是怎么转化的(X-1)(X-2)(X-3)(X-4) =(X-1)(X-4) (X-2)(X-3)=（x^2-5x+4)(x^2-5x+6)=(x^2-5x)^2+10(x^2-5x)+24=x^4-10x^3+25x^2+10x^2-50x+24=x^4-10x^3+35x^2-50x+24