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1: S=(10+20)x5/2-10x5/2)
2: S=2(4x4x3.14/2-8x4/2)
3: S=10X10X3.14/4-10X10/2
4: S=4X4X3.14/4-4X4/2+4X2/2
5: S=5X5X3.14/4-(3+5)X2/2+2X2X3.14/4-2X2/2
6: S=5X5X3.14/2-(10X10/2-10X10X3.14/8)
7:S=2X2X3.14-1.8X3.6+1X1X3.14-0.9X1.8
2: S=2(4x4x3.14/2-8x4/2)
3: S=10X10X3.14/4-10X10/2
4: S=4X4X3.14/4-4X4/2+4X2/2
5: S=5X5X3.14/4-(3+5)X2/2+2X2X3.14/4-2X2/2
6: S=5X5X3.14/2-(10X10/2-10X10X3.14/8)
7:S=2X2X3.14-1.8X3.6+1X1X3.14-0.9X1.8
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