Bài 1:b Vận dụng tính nhanh
a) 20152015.2014-20142014.2015
b) 123.456456-456.123123
c) (98.7676-9898.76):( 2001.2002.2003…….2010)
Bài 1:b Vận dụng tính nhanh
a) 20152015.2014-20142014.2015
b) 123.456456-456.123123
c) (98.7676-9898.76):( 2001.2002.2003…….2010)
`Đáp` `án` :
`a`) ${0}$
`b`) ${0}$
`c`) ${0}$
`Giải` `thích` `các` `bước` `giải` :
a) ${20152015}$ . ${2014}$ – ${20142014}$ . ${2015}$
= ${10001}$ . ${2015}$ . ${2014}$ – ${10001}$ . ${2014}$ . ${2015}$
= ${0}$
b) ${123}$ . ${456456}$ – ${456}$ . ${123123}$
= ${123}$ . ${1001}$ . ${456}$ – ${456}$ . ${1001}$ . ${123}$
= ${0}$
c) ( ${98}$ . ${7676}$ – ${9898}$ . ${76}$ ) : ( ${2001}$ . ${2002}$ . ${2003}$…….${2010}$ )
= ( ${98}$ . ${101}$ . ${76}$ – ${101}$ . ${98}$ . ${76}$ ) : ( ${2001}$ . ${2002}$ . ${2003}$…….${2010}$ )
= ${0}$ : ( ${2001}$ . ${2002}$ . ${2003}$…….${2010}$ )
= ${0}$
@`Dịu` `gửi` `bạn`
`Chúc` `bạn` `học` `tốt` !
c/(98.7676-9898.76):( 2001.2002.2003…….2010)
=0:(2001.2002.2003…2010)
=0
b/123.456456−456.123123
=123.456.1001−456.123.1001
=0