1.设与墙垂直的边长x米,0＜35-2x≤1817≤2x＜358.5≤x＜17.5x(35-2x)=150-2x^2+35x=1502x^2-35x+150=0(2x-15)(x-10)=0x=7.5（舍去）或x=1035-2x=35-2×10=15答：鸡场的长宽分别为15米,20米2.设每次降价x60(1-x)^2=52...