Đáp án+Giải thích các bước giải:

`(5+1/5-2/5)-(2-1/25-2 3/35+5/6)-(8+2/7-1/18)`

`= 5+1/5-2/5-2+1/25+73/35-5/6-8-2/7+1/18`

`= (5-2-8)+(1/5-2/5+1/25)+(73/35-2/7)+(-5/6+1/18)`

`= -5+(-1/5+1/25)+(73/35-10/35)+(-15/18+1/18)`

`= -5+(-5/25+1/25)+63/35+(-14/18)`

`= -5-4/25+9/5-7/9`

`= -5+(-4/25+45/25)-7/9`

`= -5+41/25-7/9`

`= -1125/225+369/225-175/225`

`= (-1125+369-175)/225`

`= -931/225`

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