(5*4+5*2.5)*25*3.8+5*2.6*2+3.8*2.4*2
5×3.8+(5×2.4+3.8×2.4)×2
5×3.8+(5×2.4+3.8×2.4)×2 =94.64
(5×4×2.5)-(5×3.8×2.4)