求下面各题阴影部分的面积。（单位：dm）'M/p1V8b'I2y:k+N1D/{5w,c+s;E
'M/p1V8b'I2y:k+N1D/{5w,c+s;E
算式：提示5U:v+t/k,r0s8k1R9I,@0s'M/p1V8b'I2y:k+N1D/{5w,c+s;E
答：阴影部分的面积是2c*j:k:d8P*g9R6c平方分米。'M/p1V8b'I2y:k+N1D/{5w,c+s;E
算式：提示'X*x'g(m7n7u'n,G2B'M/p1V8b'I2y:k+N1D/{5w,c+s;E
答：阴影部分的面积是1j-L(\,l2|-p-H平分厘米。'M/p1V8b'I2y:k+N1D/{5w,c+s;E