50+0.4x=0.50+0.4x=0.6x

50+0.4x=0.50+0.4x=0.6x x-0.4x=0. 0.4X=X-50 x-0.8x=0.4x=? 0.6X=0.4X+50,x=多少? x一0.4x=0. x^2=（0.4X）（0. X-0.4X=36 X+0.4X=21 X-0.4X=0.54 X-0.4x=0.39 x+ x+(x*50%)=1.5X? 0.2x+0.4x=12 x=?20x+x=420 x=? 解方程:X=7(X-12) X-0.4X=0. （X+X)+(X-X)+(X*X)+(X/X)=100 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*x*x*x*x=80000? 方程x-0.4x+360:x=3: