Đáp án:
Giải thích các bước giải:
Bài 6:
`a)` `(-1,5)+1 1/2:(2/3-1/6)`
`=(-1,5)+3/2:1/2`
`=(-1,5)+3=1,5`
`b)` `3/4:(1/2 . (-6)/5+13/5)^2`
`=3/4:(-3/5+13/5)^2`
`=3/4:2^2=3/4:4=3/16`
`c)` `(-38)/45: 2 1/9`
`=(-38)/45:19/9`
`=(-38)/45 . 9/19`
`=-2/5`
`d)` `5/24+5/9+0,75`
`=5/24+5/9+3/4`
`=(5/24+3/4)+5/9`
`=(5/24+18/24)+5/9`
`=23/24+5/9=109/72`