X/(X+40)=90%
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![X/(X+40)=90%](/uploads/image/z/6855861-21-1.jpg?t=X%2F%28X%2B40%29%3D90%25)
X/(X+40)=90%
X/(X+40)=90%
X/(X+40)=90%
详细步骤如下:
x/(x+40)=90%
x=0.9*(x+40)
=0.9x+36
x-0.9x=36
0.1x=36
x=360
祝:学业有成! Fighting!
x=0.9*(x+40)
x=0.9x+36
0.1x=36
x=360