9/20 nha

45 phần 100 nha bạn

My name is Nga. I'm 13 years old. In my free time, I often go swimming with my brother. We often go swimming at weekends. My mother s reading. She usually reads books in the morning. My fnd ather plays chess awatches sport programmes in his free time. My brothers and I sports,so we often go hiking the forest.

1. How old is Nga?

Nga is 13 years old.

2. What does she do in her free time?

She goes swimming with my brother in her free time.

3. What does Nga's mother ?

Nga's mother  s reading.

4. What does Nga's father do in his free time?

 Nga's father plays chess awatches sport programmes in his free time.

5. What do Nga and her brother ?

Nga brother and  she sports.

6. Where do they often go hiking?

They go hiking the forest.

1.Nga is 13 years old

2. She often go swimming with my brother in her free time

3. Nga's mother s reading

4. Nga's father plays chess and watches sport programmes in his free time

5.My brothers and Nga  sports

6. They often go hiking the forest

Tổng độ dài 2 đáylà:

30x2=60(m)

Chiều cao của mảnh đất là:

60x2/5=24(m)

S mảnh đất là:

\(\frac{60\cdot24}{2}=720\left(m^2\right)\)

S đất làm nhà là:

720x60%=432(m²)

Đ/s

0,8 nha

10% của 8dm là:

8:100×10=0,8(dm)

0,075kg=75g

0,075 kg = 75 g

Gọi số gà là a, số vịt là b => a + b = 50 => a = 50 - b

2/5 số gà + 3/4 số vịt được 27 con => 2a/5 +3b/4 = 27

Quy đồng lên ta có: 8a + 15b = 540

Thế a = 50 - b ta có: 

8 nhân ( 50 - b ) + 15b = 540 <=> 7b + 400 =500 <=> 7b = 140 => b = 20

=> a = 30

Kết luận: ...

Từ biểu thức suy ra:

4/7x(8/5+2/5)-1

=4/7x2+1

=8/7+1

=15/7

\(\frac{8}{5}\times\frac{4}{7}+\frac{4}{7}\times\frac{2}{5}-1\)

\(=\frac{4}{7}\times\left(\frac{8}{5}+\frac{2}{5}-1\right)\)

\(=\frac{4}{7}\times\left(2-1\right)\)

\(=\frac{4}{7}\times1\)

\(=\frac{4}{7}\)

Trả lời:

1000 . 0,04 - 100 / 2,5 + 10 . 0,4

= 40 - 40 + 4

= 4

Hok tốt!

Vuong Dong Yet

Trả lời:

\(1000.0,04-\frac{100}{2,5}+10.0,4\)

\(=40-40+4\)

\(=4\)

Hok tốt!

Bad boy