60%x-15+69=x
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60%x-15+69=x
x+x=x+15
x/(x/12+x/15)*(x/12-x/15)=60
(45% x + 15) / x = 60% x怎么解
6x-15=x-69
(X-15)/15=(X+60)/60
45x+15=60x-60
40x+15=60x-60
45x-15=60x-60
75%X-15=60%X+15
4(X+X+15)=640-60
60%x-15%x=27
x/45=x/60-15
4X+15=6X-60
(x-15)/45=(x/60)+1
(32-2X)(15-X)=60
算出方程:x/60+x(60-5)/(x+5)+[15-5x/60-5x(60-5)/(x+5)/60=x/60+(15-x)/5
x+x(x*16)=9000 x+x(x*15)=8000 求这两题X解