hospital

farmer

pretty

4G

\(A,\dfrac{9}{7}-\dfrac{6}{8}=\dfrac{72}{56}-\dfrac{42}{56}=\dfrac{30}{56}=\dfrac{15}{28}\)

\(b,\dfrac{91}{42}-\dfrac{54}{42}=\dfrac{27}{42}\)

c và d làm tương tự nhé ( mà sao dấu trừ dấu cộng bay xuống mẫu số vậy =)

\(c,\dfrac{9}{4}-\dfrac{3}{4}-\dfrac{7}{8}=\dfrac{18}{8}-\dfrac{6}{8}-\dfrac{7}{8}=\dfrac{5}{8}\) =)

hospital

farmer

pretty

4G

There are four people in my family:

My father is 52 years old.He is a doctor.He works in a hospital.My mother is 46 years old.She is a farmer.She works in a field.This is my older sister.She is very pretty.I am 6 years old.I am 6 years old.I am class 4G.

We are happy family!

a: 24/36=x/12

nên x/12=8/12

hay x=8

b: 1/x=14/56

nên 1/x=1/4

hay x=4

c: x/56=9/24=3/8

=>x=3/8x56=21

25/9-2=25/9-18/9=7/9

4-5/7=28/7-2/7=26/7

189/45-2=189/45-90/45=99/45

6-1515/1818=6-15/18=6-5/6=36/6-5/6=31/6

10

54567

\(\dfrac{12}{24}\)

\(\dfrac{3}{7}\)

Chiều dài:

\(25\times\dfrac{6}{5}=30\left(m\right)\)

Diện tích:

\(25\times30=750\left(m^2\right)\)

chiều dài là:25x6/5=30(m)

DT mảnh vườn là:25x30=740(m²)

Đ/S.....