(10+90)+(20+80)+(30+70)+(40+60)+50
=100+100+100+100+50
=100x4+50
=400+50
=450
10 + 20 +30 + 40 + 50+ 60 + 70 + 80 + 90
= ( 10 + 90 ) + ( 20 + 80 ) + ( 30 + 70 ) + ( 40 + 60 ) + 50
= 100 + 100 + 100 + 100 + 50
= 450
k mik nha làm ơn đó
10 + 20 + 30 + 40 + 50 + 60 + 70 + 80 + 90
=(10 + 90) + (20 + 80) + (30 + 70) + (40 + 60) + 50
= 100 + 100 + 100 + 100 + 50
= 400 + 50
= 450
10+20+30+40+50+60+70+80+90
=10+90 + 20+80 + 30+70 + 40+60 + 50
=100+100+100+100+50
=400+50
=450 ủng hộ mk nha!!!!
k na
10+20=30+40+50+60+70+80+90
= ( 10+90) + ( 20+80)+ ( 30+70) + ( 40+60) + 50
= 100+100+100+100+50
450
ung ho
\(10+20+30+40+50+60+70+80+90\)
\(=\left(10+90\right)+\left(20+80\right)+\left(30+70\right)+\left(40+60\right)+50\)
\(=100.4+50\)
\(=400+50\)
\(=450\)
Tíck cho mìk vs nhá Wendy Marvell!
10 + 20 + 30 + 40 + 50 + 60 + 70 + 80 + 90
= ( 10 + 90 ) + ( 20 + 80)+ ( 30 + 70 ) + ( 40 + 60 ) + 50
= 100 + 100 + 100 + 100 + 50
=100X4 + 50
=400+ 50
= 450
= ( 10+90 )+( 80+20 )+( 70+30)+( 60+40 )+ 50
= 100+100+100+100+50
= 400+50
= 450
Mong bạn chọn câu trả lời của mình!
10 + 20 + 30 + 40 + 50 + 60 + 70 + 80 + 90
= ( 10 + 90 ) + ( 20 +80 ) + ( 30 + 70 ) + ( 40 + 60 ) + 50
= 100 + 100 + 100 + 100 + 50
= 450
10 + 20 + 30 + 40 + 50n+ 60 + 70 + 80 + 90
= ( 10 + 90 ) + ( 20 + 80 ) + ( 30 + 70 ) + ( 40 + 60 )+ 50
= 100 + 100 + 100 + 100 + 50
= 450
k nha ^_-
10 + 20 + 30 + 40 + 50 + 60 + 70 + 80 + 90
= ( 10 + 90 ) + ( 20 + 80 ) + (30 + 70 ) + ( 40 + 60 ) + 50
= 100 + 100 + 100 + 100 + 50
= 450
= (10 + 90 ) + (20 + 80 ) + (30 + 70 ) + (40 + 60) + 50
=100 + 100 + 100 + 100 + 50
= 100 x 4 + 50
=400 + 50 =450
k cho minh nha
(10+90)+(20+80)+.......+(40+60)+50=100+100+100+100+50
=450
10 + 20 + 30 + 40 + 50 + 60 + 70 + 80 +90
= ( 10 + 90 ) + ( 20 + 80 ) + ( 30 + 70 ) + ( 40 + 60 ) + 50
= 100 + 100 + 100 + 100 + 50
= 400 + 50
= 450
