奇奇
妙妙
甜甜
(2+3. 5+3.5+3.5)×10-4×(2+3.5+3.5+3.5)
=12.5×10-4×12.5
=125-50
=75(平方米)
(2+3. 5+3.5+3.5)×(10-4)+2×4
=12.5×6+2×4
=75+8
= 83(平方米)
3.5×(10-4)×3+2×10
=3.5×6×3+2×10
=63+20
=83(平方米)