1Tính

1/3+;8/15, 9/2-3/8 ,15/12×36/40, 4/5:6/15

2 Tìm x biết

a,x 6/16 =4/3

b, x - 3/4 =7/16

c, x - 3/5 = 4/15: 8/3

`1.`

`1/3 + 8/15 = 5/15 + 8/15 = 13/15`

`9/2 - 3/8 = 36/8 - 3/8 = 33/8`

`15/12 xx 36/40 = 5/4 * 9/10 = 45/40 = 9/8`

`4/5 : 6/15 = 4/5 : 2/5 = 4/5 xx 5/2 = 20/10 = 2/1 = 2`

`2.`

`@ x - 6/16 = 4/3`

`x = 4/3 + 3/8`

`x = 32/24 + 9/24`

`x = 41/24`

`@ x + 6/16 = 4/3`

`x = 4/3 - 6/16`

`x = 4/3 - 3/8`

`x = 32/24 - 9/24`

`x = 23/24`

`b, x - 3/4 = 7/16`

`x = 7/16 + 3/4`

`x = 7/16 + 12/16`

`x = 19/16`

`c, x -3/5 = 4/15 : 8/3`

`x - 3/5 = 4/15 xx 3/8`

`x - 3/5 = 12/120`

`x - 3/5 = 1/10`

`x = 1/10 + 3/5`

`x = 1/10 + 6/10`

`x = 7/10`