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100+500+900+300+500+700+400+800+600+200*10
=(100+900)+(500+500)+(300+700)+(400+600)+(800+200)*10
=(1000+1000+1000+1000+1000)*10
=5000*10
=50000
![](https://rs.olm.vn/images/avt/0.png?1311)
\(100+200+300+400+500+600+700+800+900=4500\)
Tk mk nhá ???
Thanks !! ^^
![](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
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![](https://rs.olm.vn/images/avt/0.png?1311)
a) 882 936 = 800 000 + 80 000 + 2 000 + 900 + 30 + 6
b) 100 001 = 100 000 + 1
c) 101 101 = 100 000 + 1 000 + 100 + 1
d) 750 000 = 700 000 + 50 000
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
900 + 100 + x = 900 + 200
1000 + x = 1100
x = 1100 - 1000
x = 100
![](https://rs.olm.vn/images/avt/0.png?1311)
x + 100 = 200 - 700 - 100
x + 100 = - 500 - 100
x + 100 = - 600
x = - 600 - 100
x = - 700
x + 100 = 200 - 700 - 100
x + 100 = -600
x = -600 - 100
x = -700
100 + 700 + 200
= ( 100 + 700 ) + 200
= 800 + 200
= 1000
900 + 100
= 1000
100 + 700 + 200
= ( 100 + 700 ) + 200
= 800 + 200
= 1000
900 + 100
= 1000
1000
1000