1.(1) × (2) √ (3) × (4) √
(5) × (6) √ (7) ×
2.(1)③ (2)④ (3)③
(4)③ (5)②
3.S=(1/2)×(3+6)×8=36,梯形面积相同
4.(12+16)×2÷2×0.2=5.6<6, 够