32+67+113+20= (33+67-1)+110+20+3= 90+9+110+20+3=200+32
32 + 67 + 113 + 20
= 32 + ( 67 + 113+ 20 )
= 32 + 200
=232 nha
mik nha cac bn
32 + 67 + 113 + 20
= ( 32 + 20 ) + ( 67 + 113 )
= 52 + 180
= 232
32 + 67 + 113 + 20
= 32 + ( 67 + 113 + 20 )
= 32 + 200
= 232
32+67+113+20
=(32+20)+(113+67)
=52+180
=232
32 + 67 + 113 + 20
= (32 + 20) + (67 + 113)
= 52 + 180
= 232