观察下图，想一想阴影部分的面积怎样计算简便。（单位：cm）*H7M(P:w(Q4I6S/a(J(u5e
*H7M(P:w(Q4I6S/a(J(u5e
算式：提示4S1O4}.S0`;e0y(y+C*n4L6y3s*H7M(P:w(Q4I6S/a(J(u5e
答：阴影部分的面积是5\*i2I1a8Z'H平方厘米。*H7M(P:w(Q4I6S/a(J(u5e