Toán 1, -1+3-5+7-…+97-99 2, 1+2-3-4+…+97+98-99-100 06/07/2021 By Eliza 1, -1+3-5+7-…+97-99 2, 1+2-3-4+…+97+98-99-100
$1, -1+3-5+7-…+97-99$ $=-1+(-2)+(-2)+…+(-2)$ $=-1+(-2).25$ $=-1-50$ $=-51$ $2, 1+2-3-4+…+97+98-99-100$ $=(-4)+(-4)+…+(-4)+(-4)$ $=(-4).25$ $=-100$ Trả lời
1. -1+3-5+7-…+97-99 = -1 – 2 – 2 … -2 (có 25 “-2”) = -1 – 2.25 = -1 – 50 = -51 2. 1+2-3-4+…+97+98-99-100 = -4 + … + -4 ( có 25 “-4”) = -4.25 = -100 Trả lời
$1, -1+3-5+7-…+97-99$
$=-1+(-2)+(-2)+…+(-2)$
$=-1+(-2).25$
$=-1-50$
$=-51$
$2, 1+2-3-4+…+97+98-99-100$
$=(-4)+(-4)+…+(-4)+(-4)$
$=(-4).25$
$=-100$
1. -1+3-5+7-…+97-99
= -1 – 2 – 2 … -2 (có 25 “-2”)
= -1 – 2.25
= -1 – 50
= -51
2. 1+2-3-4+…+97+98-99-100
= -4 + … + -4 ( có 25 “-4”)
= -4.25
= -100