求阴影部分的面积。（单位：cm）8Y/l3?(e.S:c:V+j8N6X
8Y/l3?(e.S:c:V+j8N6X
算式：提示2H9S1b*Q/a8R1K6_-i0\5]'v2q8Y/l3?(e.S:c:V+j8N6X
答：阴影部分的面积7^-e3\(i'n:D'K5e;b平方厘米。8Y/l3?(e.S:c:V+j8N6X
8Y/l3?(e.S:c:V+j8N6X