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Bỏ dấu ngoặc rồi tính:
a) (123 - 27)+ (27+ 13-123) -= 123 - 27 + 27 + 13 - 123 = 13
b) (175 + 25 + 13)-(-15 + 175 + 25) = 175 + 25 + 13 + 15 - 175 - 25 = 28
c) (2012 - 119 + 29) - (-119 + 29) = 2012 - 119 + 29 + 119 - 29 = 20122
d) -(55 - 80 + 91) - (2012 + 80 - 91) = - 55 + 80 - 91 - 2012 - 80 + 91 = - 2067
e) 123 + [54 + (-123) + 46] = 123 + 54 - 123 + 46 = 100
f) - 64 + [(-110 + 64 + 71] = -64 -110 +64 + 71 = -39
![](https://rs.olm.vn/images/avt/0.png?1311)
$-48\times76+48\times(-123)$
$=-48\times76+(-48)\times123$
$=-48\times(76+123)$
$=-48\times199$
$=-9552$
−48.76+48.(−123)
=−48.76+(−48).123
=−48.(76+123)
=−48.199
=−9552
![](https://rs.olm.vn/images/avt/0.png?1311)
(x+7)^2-25=24
(x+7)^2 = 24+25
(x+7)^2 = 49
(x+7)^2 =7^2
x+7 =7
x =0
học tốt
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jup đi mak
ai bt lm hộ cái zùi trả công cho!!!!!!!1
![](https://rs.olm.vn/images/avt/0.png?1311)
a 13+22-20-(-133)+8
=13+22-20+133-8
=133-13+22+8-20
=120-30-20
=70
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![](https://rs.olm.vn/images/avt/0.png?1311)
\(55.48-110.24+123\)
\(=55.24.2-110.24+123\)
\(=\left(55.2-110\right).24+123\)
\(=0.24+123\)
\(=0\)