Đáp án:
Giải thích các bước giải:
`A=(-18)/47+8/24+(-29)/47+3 23/24+26/39`
`A=((-18)/47+(-29)/47)+(8/24+3 23/24)+26/39`
`A=(-1)+(8/24+95/24)+26/39`
`A=(-1)+103/24+26/39`
`A=(-24)/24+103/24+26/39`
`A=79/24+26/39`
`A=95/24`
`B=((-24)/2016+(-3)/8)+21/56`
`B=(-24)/2016+(-3)/8+21/56`
`B=(-1)/84+(-3)/8+3/8`
`B=(-1)/84+((-3)/8+3/8)`
`B=(-1)/84+0`
`B=(-1)/84`
`C=5/2.5+5/5.8+...+5/2012.2015`
`(5C)/3=3/2.5+3/5.8+...+3/2012.2015`
`(5C)/3=1/2-1/5+1/5-1/8+...+1/2012-1/2015`
`(5C)/3=1/2-1/2015`
`(5C)/3=2013/4030`
`5C=2013/4030*3`
`5C=6039/4030`
`C=6039/4030:5`
`C=6039/20150`