Thực hiện phép tính :
a)
`2020 + ( – 2021 )`
b)
`( – 2020 ) + ( – 2021 ) `
c)
` ( – 2020 ) + 2021 `
d)
`234 – 117 + ( – 100 ) + ( 234 ) `
e)
` ( – 927 ) + 1421 + 930 + ( – 1421 ) `
Thực hiện phép tính :
a)
`2020 + ( – 2021 )`
b)
`( – 2020 ) + ( – 2021 ) `
c)
` ( – 2020 ) + 2021 `
d)
`234 – 117 + ( – 100 ) + ( 234 ) `
e)
` ( – 927 ) + 1421 + 930 + ( – 1421 ) `
a,
`2020+(-2021)=2020-2021=-1`
b,
`(-2020)+(-2021)=-2020-2021=-4041`
c,
`(-2020)+2021=-2020+2021=1`
d,
`234-117+(-100)+234=234-117-100+234=251`
e,
`(-927)+1421+930+(-1421)=-927+1421+930-1421=3`
a) 2020+(-2021)
= -1
b) (-2020)+(-2021)=-(2020+2021)=-4041
c) (-2020)+2021=1
d)234-117+(-100)+234
=234-117-100+234
=117-100+234
=17+234
=251
e)(-927)+1421+930+(-1421)
= (1421-1421)+(-927+930)
= 3
xin hay nhất ạ