Bài 1: Tính nhanh nếu có thể:
1) 1449- {[(216+184):8].9 =
2) (185.99+185)- (183.101-183)=
3) (-2)+(-588)+(-50)+75+588=
4) 1999+(-2000)+2001+(-2002)=
5) (-239)+115+(-27)+215-121=
6) 25-(15-8+3)+(12-19+10)=
7) 126+(-20)+|124|-(-320)-|-150|=
8) -(-23)+(-36)+|-57|-(-29)-35=
9) -|-5|+(-19)+(+18)+|11-4|-57=
10) -(-235)+178-216+(-156)-(-21)=
Cíu tui zới! Thanks trước nha! ^^
1) 1449 - {[(216 + 184) : 8] . 9}
= 1449 - {[400 : 8] . 9}
= 1449 - {50 . 9}
= 1449 - 450
= 999
4) 1999 + (-2000) + 2001 + (-2002)
= (-1) + (-1)
= -2
6) 25 - (15 - 8 + 3) + (12 - 19 + 10)
= 25 - 10 + 3
= 18
2) (185.99+185) - (183.101-183)
= 18500 - 18300
= 200