一块梯形田的面积是90m,上底是7m,下底是11m,它的高是多少米?

题目

一块梯形田的面积是90m,上底是7m,下底是11m,它的高是多少米?

答案

90x2÷(7+11)
=180÷18
=10(米)
答：高是10米.