a) 17.(15-16)+16.(17-20)
= 17 . 15 - 17.16 + 16.17 - 16.20
= 17 . 15 - 16.20
= 255 - 320
= -65
# HOK TỐT #
Trả lời :
17 . (15 - 16) + 16 . (17 - 20) = 17 . 15 - 17 . 16 + 16 . 17 - 16 . 20 = 17 . 15 - 16 . 20 = 255 - 320 = - 65
P/s : Phía cuối k chắc_
~Std well~
#Dương
\(17.\left(15-16\right)+16.\left(17-20\right)\)
\(=17.15-17.16+16.17-16.20\)
\(=17.15-16.20\)
\(=255-320\)
\(=\left(-65\right)\)
~Hok tốt~
@@Mirai
