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co so so hang la
(100000-100)/1+1=99901(so)
Tong day so la
(100000+100)/2*99901=5000045050
dap so:5000045050
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x+100=200-500 x+800=1000
x+100=-300 x =1000-800
x =(-300)-100 x =200
x =(-300)+(-100)
x =-400
x+100=200-500
x+100=-300
x=-300+100
x=-200
x+800=1000
x=1000-800
x=200
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100-200=-100
200-300=-100
800-900=-100
k nhá
thank you
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100 x 6 x 9 x 50 x 200 x 900 x 1000 x 2000 x 900 x 10 = 874800000000000000000
![](https://rs.olm.vn/images/avt/0.png?1311)
100 + 200 + 330 + 400 + 500 + 600 + 500 + 11 + 112 + 216 + 325 + 213 + 2
= ( 100 + 200 ) + ( 400 + 600 ) + ( 500 + 500 ) + ( 330 + 11 + 112 + 216 ) + ( 325 + 213 + 2 )
= 300 + 1000 + 1000 + 669 + 540
= 1300 + 1000 + 669 + 540
= 2300 + 669 + 540
= 2840 + 540
= 3380
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![](https://rs.olm.vn/images/avt/0.png?1311)
=900+500-400+150
=1400-400+150
=1000+150
=1150
(ko dùng máy tính đâu nhớ )
100+200+300+400+500+600+700+800+900+1000
=(100+900)+(200+800)+(300+700)+(400+600)+(500+1000)
=1000+1000+1000+1000+1500
=2000+2000+1500
=4000+1500
=5500
5500
Ds 5500 nha ai k mik mik k lai