1000 - 500 - 500
= 500 - 500
= 0
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1000 - 500 - 500
= 500 - 500
= 0
3000+4000+2000+1000+500-500+500-500+500-500+500-500
500+500-1000
1000+500+500=
1000 : 500 = ?
500+1000=????????????
100+400+500+1000=?
Tính : 1000+1000-500+500x1
ai tick mk , mk tick lại
(1+ 9 + 18 + ... + 991 + 1000): 500 =............
[(12.12.12:2+100-100.2+1000-500:2-2).2]+2000