`4 1/5 + 3 2/5=(4xx5+1)/5 + (3xx5+2)/5= 21/5 + 17/5=(21+17)/5=38/5`
`4 1/5 + 3 2/5`
`= 21/5 + 17/5`
`= 38/5`
bài 1:
1/4 + 2/3 2/7 + 2/3 2/5 + 1/3 2/3 + 1/2 1/3 + 3/5 4/5 + 1/3
1/8 + 3/4 1/36 + 5/12 1/3 + 1/6 + 1/18.
bài 2:
15/16 - 3/16 17/18 - 5/6 3/4 - 4/9 1/2 - 2/5 5/6 - 3/10 3-1/3
4/5 - 1/10 5/2 - 1 5/8 - 2/5.
2/5+2/3+3/4
2/6+3/12
5/6+1/3
1/3+5/12+5/6
5/8+4/7
1/5+5/35
5/8+3/4
1/6+1/3+1/12
1/6+5/24+2/3
7/3+8/7
2/5+1/6
1/7+1/4+6/7+3/4
giúp với
và ai giải được gọi cụ
Bài 2:
a) ( 1/4 :5 x 1/3 x 1/4 ) : ( 2/3 + 1/5 :4 )
b) ( 3/4 :5 + 1/2:3/5 ) x ( 4/5 + 1/3 x2 )
1/2+{1/3+2/3}+{1/4+2/4+3/4}+1/5+2/5+3/5+4/5}
a.2/3 × 5/4 + 2/3 × 4/5 = ........ × ( 5/4 + 4/5 )
b. 5/2 × (3/7 + 1/5 ) = ...
Tính Nhanh
a) ( 1/2 + 1/3 + 1/4 + 1/5 + 1/6 ) - ( 1/2 + 1/3 + 1/4 + 1/5 )
b) ( 2/3 + 2/4 + 2/5 + 2/6 + 2/7 ) - ( 2/4 + 2/5 + 2/6 + 2/7 + 28 )
1) 1/3 x 1/2 x 3/7 2) 5/4 x 1/3 + 1/7 3) 8 x ( 8/9-2/3 ) 4) 5/6 x 48/20 x 1/2 5) ( 2/5 + 3/4 ) x 8 6) 10 x ( 1/2-1/5 )
a) = ……………………………3/7 x 4/5………………………… | 2/5 + 3/4 ………………………..……….…..…………………… |
b) =……2/5 : 4……………………………………….…………… | ……1/4 + 2………………….……….………………………… |
c) =…2/5 : 2/3……………………………………..…………..… | 2/3 - 38…………………………………………………………… |
d) 5 - 2/3………………………………………..…..………… | 2/5 x 3………………………………………………………… |
35 nhan x + 1/2 : 5/3 - 5/4 = 1/2 x 1/3
3/5 nhan x + 1/2 : 5/3 - 5/4 = 1/2 x 1/3
bài 1
4/7+4
3+6/11
3-5/7
21/9-2
15/24+2
63/45-20/25
3/4-2/8
6/7-5/8
37/45-5/9
46/39-11/13
5/12+3/4+1/3
1/2+3/7+11/14
7/10-(1/5+1/4)
15/4-2/3-3/4
