求下图中阴影部分的面积。（单位：m）(r1?,J(A3u/L
(r1?,J(A3u/L
算式：提示5T4j3?+L,}2d/u6t(r1?,J(A3u/L
答：阴影部分的面积是'F+`:J.\-f平方米。(r1?,J(A3u/L