a).X:1/2=3/4
=>x=3/4x1/2
=>x=3/8
b).X-1/2=4/5
=>x=4/5+1/2
=>x=13/10
c).X+2/3=7/5
=>x=7/5-2/3
=>x=11/15
d).X x 5/4=2/7
=>x=2/7:5/4
=>x=8/35
 

Tìm X:
a).X:1/2=3/4
=>x=3/4.1/2
=>x=3/8
b).X-1/2=4/5
=>x=4/5+1/2
=>x=6/5
c).X+2/3=7/5
=>x=7/5-2/3
=>x=7/15
d).X x 5/4=2/7
=>x=2/7.4/5
=>x=8/35

a) X= 1/2 x 3/4
    X=3/8
b) X= 4/5 + 1/2
    X= 13/10
 c) X= 2/7 : 5/4
     X= 8/35
        Chúc bạn hok tốt !!!
 

a).X:1/2=3/4
=>x=3/4x1/2
=>x=3/8
b).X-1/2=4/5
=>x=4/5+1/2
=>x=13/10
c).X+2/3=7/5
=>x=7/5-2/3
=>x=11/15
d).X x 5/4=2/7
=>x=2/7:5/4
=>x=8/35
 bài đây nhé em  chức em học tốt
 

a. x=3/4.1/2=3/8
b. x=4/5+1/2=8/10+5/10
c. x=7/5-2/3=21/15-10/15=11/15
d. x=2/7:5/4=2/7.4/5=8/35
e. x=7/3-4/7=49/21-12/21=37/21
f. x=5/9:4/13=5/9.13/4=65/36
g. x=3/4-1/2=3/4-2/4=1/4
h. x=1/2-3/4=2/4-3/4=-1/4
i. x=7/5:2/3=7/5.3/2=21/10
k. x=2/7.5/4=5/14
l. x=7/3-4/7.14/8=7/3-1=7/3-3/3=4/3

a, x = 3/4 . 1/2 
    x =    3/8 
b, x = 4/5 + 1/2 
    x =   13/10 
c, x = 7/5 - 2/3 
    x =   11/15