请用你心算的方法计算出下列图形中阴影部分的面积。4P'Y8p2o8K0C,x']3C5x1n8`/i
4P'Y8p2o8K0C,x']3C5x1n8`/i
算式：提示*B;j,r-R,T:O4P'Y8p2o8K0C,x']3C5x1n8`/i
答：阴影部分面积是9k4Q2[4f2C(H1}*v。4P'Y8p2o8K0C,x']3C5x1n8`/i
算式：提示;U*x)v,j)k;u:k9q:k4P'Y8p2o8K0C,x']3C5x1n8`/i
答：阴影部分的面积为(a8z3E(d'S2[/C3k*r*p*V5p:C。4P'Y8p2o8K0C,x']3C5x1n8`/i