解;设购买了300元的门票X张,则购买了400元的门票8-X张。300X+400×(8-X)=2700300X+3200-400X=27003200-100X=2700100X=3200-2700100X=500X=5购买了400元的门票8-5=3张。
300元的门票,(400x8-2700)/(400-300)=1400元的门票,8-1=7请采纳,你的采纳是我上进的动力!可以追问,一直到懂!!