Tính: B=2-4-6+8+10-12-14+…-2014+2016+2018-2020 Question Tính: B=2-4-6+8+10-12-14+…-2014+2016+2018-2020 in progress 0 Môn Toán Delwyn 3 years 2021-04-27T00:34:55+00:00 2021-04-27T00:34:55+00:00 2 Answers 52 views 0
Answers ( )
Đáp án:
` – 2`
Giải thích các bước giải:
` B=2-4-6+8+10-12-14+…-2014+2016+2018-2020`
`B = ( 2-4-6+8) + ( 10-12-14+16)+..+(2010 – 2012-2014 + 2016) + ( 2018-2020)`
` B = 0 + 0 + … + 0 + ( 2018 – 2020 ) `
` B = 0 + -2 `
` B = -2 `
VẬY ` B = -2`
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