Câu 1a:
a: 3/5-4/5=-1/5
b: 3-2/8=3-1/4=11/4
c: 5x1/2=5/2
d: 1/3:3=1/9
Câu 1b:
a: 4/27+7/9=4/27+21/27=25/27
b: =32/35-14/35=18/35
c: =40/63
d: =8/9x7/3=56/27
Câu 1a:
a: 3/5-4/5=-1/5
b: 3-2/8=3-1/4=11/4
c: 5x1/2=5/2
d: 1/3:3=1/9
Câu 1b:
a: 4/27+7/9=4/27+21/27=25/27
b: =32/35-14/35=18/35
c: =40/63
d: =8/9x7/3=56/27