17.6×2.4-7.6×24=(10+7.6)×2.4-7.6×2.4=10×2.4+7.6×2.4-7.6×2.4=10×2.4+(7.6×2.4-7.6×2.4)=10×2.4=24
17.6×2.4-7.6×24=（17.6-7.6）×2.4=10×24=240
240
