a] 4/12 ; 5/12 ; 11/2 ; 1/4

b] 1 ; 9/12; 12/5 ; 11/3

c] 8/21; 6/11;8/7

d] 2/3 ;2/7 15/2

a]1/3  5/12     11/2       1/4

b]1      3/4         12/5         33/9

c]8/21      6/11        8/7

d]2/3        2/7          15/2

băngf 55

bằng 55 nhé bạn

431/225

9/5 x 5/7=63/25

63/25 x 7/9=431/225

chúc học tốt

x là bao nhiêu

A sẽ bằng 22

a) x:1/5=5/7                                 b)7/4 - x= 7/9

x=5/7x1/5                                      x=7/4 -7/9

x=1/7                                             x= 35/36

\(\frac{5}{2}\) + \(\frac{1}{4}\) x \(\frac{1}{8}\)

= \(\frac{5}{2}\) + \(\frac{1}{32}\)

= \(\frac{80}{32}\) + \(\frac{1}{32}\)

= \(\frac{81}{32}\)

\(\frac{4}{3}\) + \(\frac{1}{3}\) - \(\frac{1}{5}\)

= \(\frac{5}{3}\) - \(\frac{1}{5}\)

= \(\frac{25}{15}\) - \(\frac{3}{15}\)

= \(\frac{22}{15}\)

a)

=5/2+1/32

=80/32+1/32

=81/32

b)4/3+1/3-1/5

=5/3-1/5

=25/15-3/15

=22/15

13/15 va 25/12 nhe bn

dung 100%

ai thay dung thi k minh nha

cam on cac bn nhieu

x-9/15=2/5x2/3;                                    x-5/6=11/4-3/2

x-9/15=4/15                                          x-5/6=5/4

x=4/15+9/15                                         x=5/4+5/6

x=13/15                                               x=25/12

x * 83 = 17181

x= 17181 : 83

x= 207

bằng 207 

36 x 5 + 72 - 36 x 4 + 36 x 7 = 252 - 252 - 252 = 0

36x5+72x5-36x5+36x5

=36x(5+72-36+36)

=36x77

=2772