4/5 + 5/6 : 3/2

= 4/5 + 5/9

= 61/45

3/5 : 4/6 - 3/1

= 9/10 - .3

= -21/10

4/6 : 5/4 + 3/2

= 8/15 + 3/2

= 61/30

\(\frac{4}{5}\)+ \(\frac{5}{6}\): \(\frac{3}{2}\)= \(\frac{61}{45}\)

\(\frac{3}{5}\): \(\frac{4}{6}\)- \(\frac{3}{1}\)= - \(\frac{21}{10}\)= -2,1

\(\frac{4}{6}\): \(\frac{5}{4}\)+ \(\frac{3}{2}\)= \(\frac{61}{30}\)

77/45

7/6

29/10

\(\dfrac{3}{5}+\dfrac{4}{3}\times\dfrac{5}{6}=\dfrac{3}{5}+\dfrac{10}{9}=\dfrac{27}{45}+\dfrac{50}{45}=\dfrac{77}{45}\)

\(2-\dfrac{7}{6}+\dfrac{1}{3}=\dfrac{12}{6}-\dfrac{7}{6}+\dfrac{2}{6}=\dfrac{7}{6}\)

\(\dfrac{7}{6}\times3-\dfrac{3}{5}=\dfrac{7}{2}-\dfrac{3}{5}=\dfrac{35}{10}-\dfrac{6}{10}=\dfrac{29}{10}\)

a) 1/7 + 2/7 + 3/7 + 4/7 + 5/7 +6/7 = 3

b) 1/2 + 2/4 + 3/6 + 4/8 + 5/10 + 6/12 = 3

câu a bằng 3 nha
câu b cũng bằng 3 nha

3 x \(\frac{4}{11}\) = \(\frac{3}{1}\) x \(\frac{4}{11}\) = \(\frac{12}{11}\)

1 : \(\frac{5}{4}\) = \(\frac{1\times4}{5}\) = \(\frac{4}{5}\)

\(\frac{4}{5}\) x \(\frac{6}{7}\) + \(\frac{2}{3}\) = \(\frac{24}{35}\) + \(\frac{2}{3}\) = \(\frac{142}{105}\)

\(\frac{3}{4}\) + \(\frac{1}{2}\) : \(\frac{5}{6}\) = \(\frac{3}{4}\) + \(\frac{1}{2}\) x \(\frac{6}{5}\) = \(\frac{3}{4}\)+ \(\frac{6}{10}\) \(\frac{27}{20}\)

\(\frac{3}{4}\)+ \(\frac{1}{2}\) = \(\frac{3}{4}\) + \(\frac{2}{4}\)= \(\frac{5}{4}\)

Huhu, giúp mk đi mừ!!!

B. 1/6 ; 2/3 ; 3/4 ; 5/4

2/3×3/4×4/5÷1/5=2

2/5×3/4×5/6÷3/4=0.33333333333......

2/3 x 3/4 x 4/5 : 1/5 = 6/12 x 4/5 :1/5 = 24/60 :1/5 = 4/10 : 1/5 = 4/10 x 5/1 = 20/10 = 2

2/5 x 3/4 x 5/6 : 3/4 = 6/20 x 5/6 : 3/4 = 3/10 x 5/6  : 3/4 = 15/60 : 3/4 = 1/4 : 3/4 = 1/4 x 4/3 = 4/12 = 1/3

k cho mk nha!

= 1192 nhé

 hok tốt

:D

Ko cần vẽ sơ đồ nếu bạn thích thì vẽ

Số cây ở khối 5 là:120÷(7-5)×7=420 (cây)

Số cây ở khối ba là:420-120=300(cây)

Số cây ở khối 4 là:300÷3×5=500(cây)

7/5;7/6 và 3/2