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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+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
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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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1,25 x 800 x 6,7 = (1,25 x 800) x 6,7 = 1000 x 6,7 = 6700
7,89 x 0,5 x 200 = 7,89 x (0,5 x 200) = 7,89 x 100 = 789
4,5 x 2,5 x 40 x 80 = (4,5 x 80) x (2,5 x 40) = 360 x 100 = 36000
2,5 x 5,5 x 2,4 = 2,5 x 5,5 x 0,6 x 4 = (2,5 x 4) x (5,5 x 0,6) = 10 x 3,3 = 33
k mk nha
x = 800 : 200 + 3
x = 4 + 3
x = 7
x = 400 + 3
x =403