170+180+190+200+210+220
=(180+220)+(190+210)+200+170
=400+400+200+170
=1170
170+180+190+200+210+220
=350+390+430
=740+430
=1170
170 + 180 + 190 + 200 + 210 + 220
= ( 180 + 220 ) + ( 190 + 210 ) + 200 + 170
= 400 + 400 + 200 + 170
= 400 x 2 + 200 + 170
= 800 + 200 + 170
= 1000 + 170
= 1170
=
170 + 180 + 190 + 200 + 210 + 220
= ( 170 + 220 ) + (180 + 210 ) + ( 190 + 200 )
= 390 + 390 + 390
= 390 x 3 = 1170
170 + 180 + 190 + 200 + 210 + 220
= 170 + 200 + 180 + 220 + 190 + 210
= ( 170 + 200 ) + ( 180 + 220 ) + ( 190 + 210 )
= 370 + 400 + 400
= 1170
k mk nha