224乘以56除以(7分之3减8分之3)
=224×(56×3/7-56×3/8)
=224×(24-21)
=224×3
=672
2001分之1加2001分之2+……+2001分之2000
=1/2001×(1+2+……+2000)
=1/2001×(1+2000)×2000/2
=1/2001×2001×1000
=1000
224乘以56除以(7分之3减8分之3)
=224×(56×3/7-56×3/8)
=224×(24-21)
=224×3
=672
2001分之1加2001分之2+……+2001分之2000
=1/2001×(1+2+……+2000)
=1/2001×(1+2000)×2000/2
=1/2001×2001×1000
=1000