642 + 455 + 438 + 675= (642+438)+(455+675)
= 1080+ 1130
= 2210
Hôctot
642 + 455 + 438 + 675
=(455+675)+(642+438)
=1130+1080
=2210
\(642+455+438+675\)
\(=1080+1130\)
\(=2210\)
\(=\left(642+438\right)+\left(455+675\right)\)
\(=1850+1130\)
\(=2980\)
\(642+455+438+675=\left(455+675\right)+\left(642+438\right)=1130+1080=2210\)
\(642+455+438+675\)
\(=1080+1130\)
=2110
642 + 455 + 438 + 675= (642+438)+(455+675)
= 1080+ 1130
= 2210
Chúc bạn học tốt
642 + 455 + 438 + 675= (642+438)+(455+675)
= 1080+ 1130
= 2210
642 + 455 + 438 + 675
= ( 642 + 438 ) + ( 455 + 675 )
= 1070 + 1130
= 2200
Tính nhanh :
642 + 455 + 438 + 675
=(642+438)+(455+675
=1080+1130
=2210
hok tok
