可以吧。两个乘式之间是加吧?原式=18×2×2.8 + 32×5.6=18×5.6 + 32×5.6=5.6×(18+32)=5.6×50=280
36×2.8+32×2×2.8=36×2.8+64×2.8=(36+64)×2.8=280