x-0.

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x-0.x-0.x-0.x-0.5x=20（1-0.5）x=200.5x=20x=40x=400.5x＝20x＝20÷0.5x＝40X-0.5X=200.5X=20X=40X-0.5X=200.5X=

x-0.
x-0.

x-0.
x-0.5x=20
（1-0.5）x=20
0.5x=20
x=40

x=40

0.5x＝20
x＝20÷0.5
x＝40

X-0.5X=20 0.5X=20 X=40

X-0.5X=20
0.5X=20
X=40

x+0.75x/0. 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-0. x-0. x-0. X-0. x-0.25x=0. x+4.5x=0. X-0.25x=0. 4.8x-x=0. X-0.25x=0. 2.2x-x=0. 120X-X=0. x-0.4x=0. 1.2x-x=0. X-0.48X=0. 16^X - 12^X -9^X = 0.求X. (98-X)+(100-X)+X=X/0.