X/(X+40)=90%

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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+36x-0.9x=360.1x=36x=360祝:学业

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