解方程:X-20%X=40
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解方程:X-20%X=40
解方程:X-20%X=40
解方程:X-20%X=40
X-20%X=40
80%X=40
X=40/80%
X=50
X-20%X=40
X-0.2X=40
0.8X=40
X=50
50.
x-0.2x=40
0.8x=40
x=50
X-0.2X=40
0.8X=40
X=50
X=50
解方程:X-20%X=40
解方程:X-20%X=40
解方程:X-20%X=40
X-20%X=40
80%X=40
X=40/80%
X=50
X-20%X=40
X-0.2X=40
0.8X=40
X=50
50.
x-0.2x=40
0.8x=40
x=50
X-0.2X=40
0.8X=40
X=50
X=50