Tổng số tiền của 3 quyển vở:
\(50000-11000=39000\)(đồng)
Giá của mỗi quyển vở:
\(39000:3=13000\)(đồng)

giúp mình ạ!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

15000 đồng đúng ko

Cô bán hàng trả lại bạn Hoàn 1000 đồng

Đáp án D

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câu 1: 739

câu2:6295

long mua 3 quyển vở hết số tiền là :

7600 x 3 = 22800 ( đồng )

Cô bán hàng phải trả lại cho Long số tiền là :

30000 - 22800 = 7200 ( đồng )

Đáp số :............

Long mua 3 quyển vở hết số tiền là :

                  7600 x 3 = 22800 ( đồng )

Cô bán hàng phải trả lại cho Long số tiền là :

                  30000 - 22800 = 7200 ( đồng )

                                           Đáp số : 7200 đồng 

Việt mua hết số tiền là:

    6 000 x 6 = 36 000 (đồng)

Cô bán hàng trả lại cho Việt số tiền là:

    100 000 – 36 000 = 64 000 (đồng)

Đáp số: 64 000 đồng

                   Bài giải

      Lúc đầu mẹ có số tiền là:

(18000 + 27000) + 5000 = 50000(đồng) 

                                      Đáp số: 50000 đồng.

ủa làm j đủ tiền đâu mà cô bán hàng phải trả lại tiền có 10000 mà mua sách với bút hết 90000 

Hỏi câu j lạ zậy