Toán Lớp 5: 1+2-3-4+5+6-7-8+9+…+2018-2019-2020+2021-2022
Leave a reply
Register Now
Login
Lost Password
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Toán Lớp 5: 1+2-3-4+5+6-7-8+9+…+2018-2019-2020+2021-2022
Comments ( 2 )
A=1+2-3-4+5+6-7-8+9+….+2018-2019-2020
=(1+2-3-4)+(5+6-7-8)+…+(2017+2018-2019-2020)
=(-4)+(-4)+…+(-4) (505 số (-4))
=(-4)x505
@halinh09111
#hoidap247
=-2020
Giải đáp:
A=1+2-3-4+5+6-7-8+9+….+2018-2019-2020
=(1+2-3-4)+(5+6-7-8)+…+(2017+2018-2019-2020)
=(-4)+(-4)+…+(-4) (505 số (-4))
=(-4)x505
=-2020