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17 tháng 3 2017

15 phút 45 giây =945 giây 

5 bông hoa : 945 giây 

1 bông hoa :.......giây ?thời gian làm  một bông hoa =945 nhân 1 : 5

đáp án : thời gian làm 1 bông hoa mất 189 giây hoặc 3 phút 15 giây nha bạn !

25 tháng 11 2018

Trung bình làm một bông hoa hết số thời gian là:

15 phút 45 giây : 5 = 3 phút 9 giây

Đáp số: 3 phút 9 giây

15 tháng 10 2021

hello

14 tháng 3 2022

Giúp mik với mn

14 tháng 3 2022

Trung bình mỗi bạn đó làm được một bông hoa trong số thời gian là :

16 phút 45 giây : 5 = 3 phút 21 giây

Đáp số : 3 phút 21 giây

27 tháng 3 2023

Đổi 15p45s=15,75p

Trugn bình 1 bông hoa làm trong

15,75 : 5=3,15(phút)

27 tháng 3 2023

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15 tháng 3 2022

3 phút 9 giây

15 tháng 3 2022

TB 1 bông hoa làm trong thời gian là:

15p45s:5=3p9s

Đ/S...

6 tháng 7 2017

Đổi 15 phút 45 giây = 945 giây . Vậy trung bình bạn đó làm 1 bông hoa hết số thời gian là :                                                                                             945 : 5 = 189 (giây)                                                                                                                                                                                      =3 phút 9 giây                                                                                                                                                                              Đáp số : 3 phút 9 giây

6 tháng 7 2017

      Đổi 15 phút 45 giây =  945 giây

Trung bình bn đó làm 1 bông trong số giây là:

        945:5=189(giây)

             Đáp số: 189 giây

26 tháng 8 2017

Đáp án B.

19 tháng 3 2017

Đáp án đúng : A

27 tháng 3 2022

                         Giải

Đổi :

15 phút 45 giây=15,75 phút

Mỗi bông hoa làm hết số thời gian là :

           15,75 : 5 = 3,15(phút)

3,15 phút = 3 phút 9 giây

               Đáp số : 3 phút 9 giây