35 .20+ 35.80 + 15.80 + 15.20
= [ 35 . ( 20 + 80 ) ] + [ 15 . ( 80 + 20 )
= 35 .100 + 15 . 100
= 35 000 + 15 000
= 50 000
\(35.20+35.80+15.80+15.20\)
\(=35.\left(20+80\right)+15.\left(20+80\right)\)
\(=35.100+15.100\)
\(=100.\left(35+15\right)\)
\(=100.50\)
\(=5000\)
\(35.20+35.80+15.80+15.20\)
\(=35.\left(20+80\right)+15.\left(80+20\right)\)
\(=35.100+15.100\)
\(=\left(35+15\right).100\)
\(=50.100\)
\(=5000\)
35.20 + 35.80 + 15.80 + 15.20
=35.(20+80) + 15.(80+20)
=35.100 + 15.100
=(35+15).100
=50.100
=5000
35 . 20 + 35 . 80 + 15 . 80 + 15 . 20
= 35 . (20 + 80) + 15 . (80 + 20)
= 35 . 100 + 15 . 100
= (35 + 15) . 100
= 50 . 100
= 5000
35.20+35.80+15.80+15.20
=35(20+80)+15(80+20)
=35.100+15.100
=100(35+15)
=100.50
=5000
I think thế này là ngắn gọn nhất rồi understand 
