2 lúc đầu bán số gạo là:

\(\dfrac{1}{3}+\dfrac{1}{5}=\dfrac{8}{15}\)(tổng số gạo lúc đầu)

Tương ứng bán số gạo lần ba là:

1-\(\dfrac{8}{15}\)=\(\dfrac{7}{15}\)(tổng số gạo lần ba)

Lúc đầu cửa hàng bán số tạ gạo là:

21:\(\dfrac{7}{15}\)=45(tạ)

Đ/S:45 tạ gạo

In recent years, modern families tend to be not closer anymore. In this essay, I am going to give reasons for explaining this unfortunate truth, and suggest what can be done for helping family members to have more time together. Nowadays, dealing with busy and pressure life, more and more people spend less time for their time, leads to the broken of family closeness. Adults usually work all day, from early morning to midnight, provide a route to behave too formally in family because of lacking of time being together.As an example, a typical family in a developed society just spend\(\dfrac{1}{15}\) of their time for family activities. Furthermore, in this competitive community, it is forced that people have to work as much as they can, making they too tired when return back home and just want to relax, not confiding or entertaining with their children. As a result, families are become more and more detached. However, there are some solutions for this problem, such as spend less time for working. A research pointed out that human often wasting time in office for chatting with colleagues or cleaning their inbox. If adults can use their time more wisely, they will save valuable time for being with family. In addition, aware the paramount of together time will motivate parents to be at home on time, which is benefit for educating children, according to an adviser. Altogether, adults should spend at least 2 hours for family per day to build up a happy household. In conclusion, there are many causes leads to standoffishness in modern family. Otherwise, if family members recognize and acknowledge the importance of closeness, they may spend a little bit of time in their busy life to being together.

ê chết quên mk sửa lại nha 9×27=243

Chiều dài thửa ruộng hình chữ nhật đó là:

60\(\times\dfrac{5}{3}\)=100(m)

a,Diện tích thửa ruộng hình chữ nhật đó là:

100\(\times\)60=6000(m²)

b,Cả thửa ruộng đó thu được số tạ ngô là:

(6000:100)\(\times\)30=1800(kg)

1800kg=18 tạ

Đ/S:a,6000m²

       b,18 tạ ngô

Chúc bạn học tốt.

(45027):50

=(450:5)\(\times\)27

=90\(\times\)27

=2430

em cảm ơn chị em quên

(450\(\times\)27):50

=12150:50

=243

\(\dfrac{32}{56}=\dfrac{4}{7}\)