题目

阅读理解When Carnevali's son started at St Mary primary school in London, he was alarmed to find that pupils were sometimes kept indoors at break times, despite a large playground.The reason was the nearby six-lane road, which has up to 100, 000 vehicles thundering past the school each day. As evidence mounted about the impact of gas waste on children's health, the headteacher restricted time outside. Carnevali and other parents decided to take action. Within months they had crowdfunded almost £100, 000, and last month a 126-metre living wall of 12, 000 plants was installed (安装) as pa已知函数f(x)=x3+ax2+2bx+c在(0,1)内取得极大值,在(1,2)内取得极小值,求的取值范围.