10.25.21.36.30

2x5=10

5x5=25

7x3=21

4x9=36

3x10=30

k mk nhoa!!!!

120²³

tính khùng lun á bạn

Câu 3: 
Chiều rộng là 90x3/5=54(m)

Chu vi là (90+54)x2=288(m)

Câu 4:

Chiều rộng là 60x3/5=36(m)

Chu vi là (60+36)x2=192(m)
Diện tích là 60x36=2160(m²)

a) \(\dfrac{2}{5}\cdot\dfrac{1}{7}+\dfrac{2}{5}\cdot\dfrac{5}{7}+\dfrac{2}{5}\)

\(=\dfrac{2}{5}\left(\dfrac{1}{7}+\dfrac{5}{7}+1\right)\)

\(=\dfrac{2}{5}\cdot\dfrac{13}{7}=\dfrac{26}{35}\)

b) \(\dfrac{1}{5}+\dfrac{2}{8}+\dfrac{4}{5}+\dfrac{7}{8}-\dfrac{1}{8}\)

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

\(=1+1=2\)

c)\(\dfrac{24}{36}\cdot\dfrac{10}{12}\cdot36\)

\(=\dfrac{24\cdot10\cdot36}{36\cdot12}=\dfrac{12\cdot2\cdot10\cdot36}{12\cdot36}\)

\(=2\cdot10=20\)

a) 197148:84=2347

101598:287=354

b)9/20-8/5x5/12= -13/60

2/3:4/5:7/12=10/7

4/9+11/8-5/6=71/72

tính :

a) 197148:84=2347

101598:287=354

b)9/20-8/5x5/12= -13/60

2/3:4/5:7/12=10/7

=4/9+11/8-5/6=71/72

`14/9:8/3=14/9xx3/8=[2xx7xx3]/[3xx3xx4xx2]=7/12`

`5/4+9/5xx5/4=5/4+9/4=14/4=7/2`

14/9:8/3=7/12
5/4+9/5x5/4=5/4+9/4=14/4=7/2

1 + 1 x 1 +1 = 1 + 1 +1 = 3
2 + 2 x 2 +2 = 2 + 4 + 2 = 8
3 + 3 - 3 + 3 = 6 - 3 + 3 = 6
4 - 4 + 4 - 4 = 0 + 4 - 4 = 0
5 x 5 - 5 x 5 = 25 - 25 =0
1 + 1 + 2 + 3 + 4 + 5 = 16
1 x 1 x 2 x 3 x 4 x 5 = 120

1 + 1 x 1 + 1 = 3

2 + 2 x 2 + 2 = 8

3 + 3 x 3 + 3 = 15

4 - 4 + 4 - 4 = 0

5 x 5 - 5 x 5 = 0

1 + 1 + 2 + 3 + 4 + 5 =16

1 x 1 x 2 x 3 x 4 x 5 = 120

k nh