làm giúp mk
a 2/3 + 5/2 – 3/4 2/5 x 1/2 : 1/3
b 4/5 – 1/2 + 1/3 1/2 x 1/3 + 1/4 2/7 : 2/3 – 1/7
/ là phần nha
làm giúp mk
a 2/3 + 5/2 – 3/4 2/5 x 1/2 : 1/3
b 4/5 – 1/2 + 1/3 1/2 x 1/3 + 1/4 2/7 : 2/3 – 1/7
/ là phần nha
Đáp án:
Giải thích các bước giải:
a) 2/3+5/2-3/4
->8/12+30/12-9/12
=29/12
2/5 x 1/2 : 1/3
=1/5 x 3
=3/5
b) =24/30-15/30+10/30
=19/30
1/2 x 1/3 +1/4
=1/6+6/24
=(4+6)/24
=10/24=5/12
2/7 : 2/3 – 1/7
=2/7 x 3/2-1/7
=3/7-1/7
=2/7
a) 2/3+5/2-3/4=8/12+30/12-9/12=29/12
2/5 x 1/2 : 1/3 = 1/5:1/3=1/5 x 3=3/5
b) 4/5 – 1/2 + 1/3 = 24/30-15/30+10/30=19/30
1/2 x 1/3 + 1/4=1/6+1/4=4/24+6/24=10/24=5/12
2/7 : 2/3 – 1/7 = 2/7 x 3/2 – 1/7 = 3/7-1/7 = 2/7