Đáp án + Giải thích các bước giải:
`a)-2/9. 5/13+(-2/9). 8/13+1 2/9`
`=-10/117+(-16/117). 8/13+2/9`
`=-26/117+2/9=-234/1053+234/1053`
`=0`
`b)\sqrt{144}-5.\sqrt{16/9}+|-5 1/3|`
`=12-5. 4/3+|-5/3|`
`=12-20/3+5/3=12-25/3`
`=\frac{36-25}{3}=11/3`
`c)\frac{21^4}{27.(-343)}+7=194481/-9261+ -6827/9261`
`=129654/-9261=129654:-9261`
`=-14`
`text{#Study Well}`