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

X/(X+40)=90% X/(X+40)=90% x-40%x= (90-x)(40%-1.6%x)=12怎么解x x/40-x/90=5 (90+x)(40+x)=5000帮帮.. （X+X)+(X-X)+(X*X)+(X/X)=100 x-40%x-40%x=15 x+40=2x x=? x*x-x=90怎么解 90-x=2x(18+x) X×X+(40-X)=58 X乘以X等于40 ---------------------X=? 10x+x*x=40 (x+40%x)×85%-x=95 (x+40%x)×85%-x=95 4x+x=40x 40%x+70%x-x=1.8