Với năng suất như vậy thì cần:

9x8:9=8(người)

P/s:...

hộc tốt

thanks bạn

6 người làm xong công việc trong số giờ là:

    8 x 9 = 72 ( giờ )

1 người làm xong công việc trong số giờ là:

    72 x 6 = 432 ( giờ )

Nếu mỗi ngày làm 9 giờ thì 6 ngày làm trong:

    9 x 6 = 54 ( giờ )

Vậy để hoàn thành công việc trong 6 ngày, mỗi ngày làm 9 giờ thì cần:

    432 : 54 = 8 ( người )

             Đáp số : 8 người

\(8người\)

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Biết 9 người làm trong 10 ngày, mỗi ngày làm 8 giờ thì hoàn thành công việc.

Nên 9 người hoàn thành công việc trong số giờ là:

   10×8=8010×8=80 (giờ)

Một người hoàn thành công việc cần số giờ là:

   9×80=7209×80=720 (giờ)

Nếu 1 ngày làm 9 giờ, một người cần làm số ngày là:

   720:9=80720:9=80 (ngày)

Nếu muốn 5 ngày hoàn thành công việc thì cần số người là:

    80:5=1680:5=16 (người)

Vậy cần bổ sung số người là:

    16−9=716−9=7 (người)

                     Đáp số: cần thêm 7 người

k cho mình nhha

               BÀI GIẢI: 

1 người làm xong công việc trong số giờ là:

         (8 x 9 ) x 6 = 432 ( giờ ) 

Vậy để hoàn thành công việc đó trong 6 ngày , mỗi ngày cần làm 9 giờ thì cần : 

         432 : ( 9 x 6 ) = 8 ( người ) 

               Đáp số: 8 người