300-100 bằng
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
50+100+150+200+250+300+350+400+450
=(50+450)+(100+400)+(200+300)(150+350)+250
=500+500+500+500+250
=500x4+250
=2000+250
=2250
Chúc bạn học giỏi nha
K cho mik vs nhé
50 + 100 + 150 + 200 + 250 + 300 + 350 + 400 + 450
= ( 50 + 450 ) + (100 + 400 ) + ( 150 + 350 ) + ( 200 + 300 ) + 250
= 100 + 100 + 100 + 100 + 250
= 400 + 250
= 650
CHÚC BẠN HỌC TỐT NHÉ !
![](https://rs.olm.vn/images/avt/0.png?1311)
100+200+300+400+500+600+700+800+900
=(100+900)+(200+800)+(300+700)+(400+600)+500
=1000+1000+1000+1000+500
=4500
100 + 200 +300 + 400 + 500 + 600 +700 + 800 + 900
=100 x ( 1 + 2 + 3 + 4 +5 + 6 + 7 + 8 + 9 )
=100 x 45
=4500
![](https://rs.olm.vn/images/avt/0.png?1311)
300 + 300 + 300 + 300 + 100
= 300 x 4 + 100
= 1200 + 100
= 1300
happy new year
300+300+300+300+100
=300x4+100
=1200+100
=1300
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
B. 173 + 45 + 135 + 27 + 50
= (173+27) + (45 +135) +50
=200 + 180 + 20 + 30
= 200 +200 +30
=430
![](https://rs.olm.vn/images/avt/0.png?1311)
b, 53 + 45 + 135 + 147 + 50
= ( 53 + 147 ) + ( 45 + 135 ) + 50
= 200 + 180 + 50
= 200 + 330
= 530
b, 53 + 45 + 135 + 147 + 50
=(53+147)+(45+135+50)
=200+230
=430
![](https://rs.olm.vn/images/avt/0.png?1311)
300 - 100 = 200
bằng 200