1 thực hiện phép tính. a) (4_1/9 +3_1/4).2_1/2 +2_3/4. b) 1+(9/10-4/5)÷3_1/6. c) -2/11×11/9 + (-2/11) ×8/19 + (-4/11). d) -5/18 +5/9 -11/36

Đáp án `+` Giải thích các bước giải:

`a,`

`(4 1/9 + 3 1/4 ) . 2 1/2 + 2 3/4 `

`=(37/9 + 13/4) . 5/2 + 11/4`

`=265/36 . 5/2 + 11/4`

`=1325/72 + 11/4`

`=1523/72`

`b,`

`1 + (9/10 - 4/5) : 3 1/6`

`=1 + 1/10 : 19/6`

`=1 + 3/95`

`=98/95`

`c,`

`-2/11 xx 11/9 + (-2/11) xx 8/19 + (-4/11)`

`=-2/11 xx (11/9 + 8/19) - 4/11`

`=-2/11 xx 281/171 - 4/11`

`=-562/1881 - 4/11`

`=-1246/1881`

`d,`

`-5/18 +5/9 -11/36`

`=-10/36 + 20/36 - 11/36`

`=(-10 + 20 - 11)/36`

`=-1/36`