Ai bt câu trả lời thì giúp mik nhé , mik cần gấp.

a)17/7

b)y=0,4

Chúc e học giỏi

a: 2/9-4/9=-2/9

b: 5/7-4/14=5/7-2/7=3/7

c: -2-5/8=-16/8-5/8=-21/8

d: =6/13+14/39=18/39+14/39=32/39

e: =4/5+4/18=72/90+20/90=92/90=46/45

f: =5/30-12/30=-7/30

g: =-63/63=-1

h: =4/13x26=4x2=8

a: 2/9-4/9=-2/9

b: 5/7 - 4/14 = 5/7 - 2/7 = 3/7

c: -2 - 5/8 = - 16/8 - 5/8 = - 21/8

d: = 6/13 + 14/39 = 18/39 + 14/39 = 32/39

e: = 4/5 + 4/18 = 72/90 + 20/90 = 92/90 = 46/45

f: = 5/30 - 12/30 = -7/30

g: = - 63/63 = -1

h: = 4/13 . 26 =4 . 2 = 8

2/3

4

\(\dfrac{13}{15}-\dfrac{1}{5}=\dfrac{13}{15}=\dfrac{3}{15}=\dfrac{10}{15}=\dfrac{2}{3}\)

\(\dfrac{7}{8}\times\dfrac{2}{7}=\dfrac{14}{56}=\dfrac{1}{4}\)

2/5 + 4/5 : 6/5

= 2/5 + 4/5 . 5/6

= 2/5 + 20/30

= 6/15 + 10/15

= 16/15

\(\frac{2}{5}+\frac{4}{5}:\frac{6}{5}=\frac{16}{15}\)

\(\frac{2}{5}+\frac{4}{5}:\frac{6}{5}\)

\(=\frac{2}{5}+\frac{4}{5}\times\frac{5}{6}\)

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

\(=\frac{6}{15}+\frac{10}{15}\)

\(=\frac{16}{15}\)

a, 3/5 : -5 = -3/25

b, 24 : -6/7 = -28

c, -4/15 : 2 = -2/15

\(\frac{7}{15}+\frac{2}{10}=\frac{14}{30}+\frac{6}{30}=\frac{20}{30}=\frac{2}{3}\)

\(\frac{8}{3}+\frac{4}{3}=\frac{12}{3}=\frac{4}{1}=4\)

a, \(\frac{7}{15}+\frac{2}{10}=\frac{2}{3}\)

b,\(\frac{8}{3}+\frac{4}{3}=4\)

\(\frac{7}{15}\)\(+\frac{2}{10}\)\(=\frac{2}{3}\)

\(\frac{8}{3}\)\(+\frac{4}{3}\)\(=4\)

\(\frac{1}{2}\times\frac{2}{3}\times\frac{3}{4}\)

\(=\frac{1\times2\times3}{2\times3\times4}\)

\(=\frac{1}{4}\)

1/2 x 2/3 x 3/4 = 1/3 x 3/4 = 1/4

hok tốt

1/2 . 2/3 . 3/4

= 1/3 . 3/4

= 1/4