x+678=2813

x=2813-678

x=2135

4529+x=7685

x= 7685-4529

x= 3156

x-358=4768

x= 4768+358

x= 5126

2495-x=698

x= 2495-698

x= 1797

xX23=3082

x= 3082:23

x= 134

36Xx= 27612

x= 27612:36

x= 767

x:42= 938

x= 938x42

x= 39396

4080:x=24

x= 4080:24

x= 170

x + 678 = 2813

x = 2813 - 678

x = 2135

4529 + x = 7685

x = 7685 - 4529 

x = 3156

x - 358 = 4768

x = 4768 + 358

x = 5126

2495 - x = 698

x = 2495 - 698

x = 1797

x . 23 = 3082

x = 3082 : 23 

x = 134

36 . x = 27612

x = 27612 : 36

x = 767

x : 42 = 938

x = 938 . 42

x = 39396

4080 : x = 24

x = 4080 : 24

x = 170

nha

éo nhé

TL:

13/17 nha

HT

K mik nha 

lời giải chi tiết

\(\frac{1313}{1717}\)\(=\frac{1313}{1717}\)\(\frac{\div101}{\div101}\)\(=\frac{13}{17}\)

hok tốt nha

ok nhaaaaaaaaaaa

ok nha

4/7:2/5-3/8

= 4/7x5/2-3/8

=10/7-3/8

= 59/56

a)2/5+3/5 = 1

b)7/8+5/8 = 12/8= 3/2

c) 1/2+1/3 = 5/6

d) 2/7+1/6= 19/42

a, 2/5 + 9/15          28/32 + 45/72               b, 4/8 + 8/24                 8/28 + 5/30

= 2/5 + 3/5            = 7/8 + 5/8                     = 1/2 + 1/3                   = 2/7 + 1/6

= 1.                        = 3/2.                              = 5/6.                            = 19/42.

k cho mik nha !

124 nha

Bài 1: \(\frac{4}{5}+\frac{2}{5}=\frac{6}{5}\) ; \(\frac{1}{6}+\frac{2}{6}+\frac{5}{6}=\frac{8}{6}=\frac{4}{3}\) ; \(\frac{2}{5}+\frac{3}{4}=\frac{8}{20}+\frac{15}{20}=\frac{23}{20}\);\(\frac{4}{7}+\frac{3}{4}+\frac{2}{7}=\frac{6}{7}+\frac{3}{4}=\frac{24}{28}+\frac{21}{28}=\frac{45}{28}\)

6/5 ; 8/6 ; 23/20 ; 45/28