Đáp án: b1 3*1/7=3/7 b2 a)x-2/3=4/5+1/3 x-2/3=12/15+5/15 x-2/3=17/15 x=17/15+2/3 x=17/15+10/15 x=9/5 b)x+1/8=1/2*1/3 x+1/8=1/6 x=1/6-1/8 x=8/48-6/48 x=1/24 c)x:2/7=2/3*3/4 x:2/7=1/2 x=1/2*2/7 x=1/14 d)x*1/7=3/4:9/8 x*1/7=3/4*8/9 x*1/7=2/3 x=2/3:1/7 x=2/3*7 x=14/3 bài 3 a)=5/2 b)=55/8 c)=59/8 d)=90/7 e)165/13 f)=24155/12 Reply
Đáp án:
b1
3*1/7=3/7
b2
a)x-2/3=4/5+1/3
x-2/3=12/15+5/15
x-2/3=17/15
x=17/15+2/3
x=17/15+10/15
x=9/5
b)x+1/8=1/2*1/3
x+1/8=1/6
x=1/6-1/8
x=8/48-6/48
x=1/24
c)x:2/7=2/3*3/4
x:2/7=1/2
x=1/2*2/7
x=1/14
d)x*1/7=3/4:9/8
x*1/7=3/4*8/9
x*1/7=2/3
x=2/3:1/7
x=2/3*7
x=14/3
bài 3
a)=5/2
b)=55/8
c)=59/8
d)=90/7
e)165/13
f)=24155/12