123+25=????
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
25+(x-5)=123-(15-123)
=>x-5+25=123-15+123
=>x+20=246-15=231
=>x=231-20=211
![](https://rs.olm.vn/images/avt/0.png?1311)
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)
c: -62+x=-14+46
=>\(x-62=46-14=32\)
=>\(x=32+62=94\)
d: \(25+\left(x-5\right)=-123-\left(15-123\right)\)
=>\(x-5+25=-123-15+123\)
=>\(x+20=-15\)
=>\(x=-15-20=-35\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,123\times54+27\times123-12\times123+123\times31\)
\(=123\times\left(54+27-12+31\right)\)
\(=123\times100\)
\(=12300\)
\(b,\dfrac{121}{27}\times\dfrac{54}{11}< n< \dfrac{100}{21}:\dfrac{25}{126}\)
\(22< n< \dfrac{100}{21}\times\dfrac{126}{25}\)
\(22< n< 24\)
Vì \(23>22\) và \(23< 24\) nên \(n=23\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a123x54+27x123-12x123+123x31
=123:54+27:123-12:123+123:31
=6642+27:123-12:123+123:31
=6642+3321-12:123+123:31
=6642+3321-1476+123:31
=6642+3321-1476+3813
=12300
b,121/27x54/11<n>100/21:25/126
=22<n>24
n=23
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(=\frac{3}{17}-\frac{2}{345}+\frac{5}{12}+\frac{2}{345}-\frac{3}{17}+\frac{1}{12}\)
\(=\left(\frac{3}{17}-\frac{3}{17}\right)+\left(\frac{2}{345}-\frac{2}{345}\right)+\left(\frac{5}{12}+\frac{1}{12}\right)\)
\(=\frac{6}{12}=\frac{1}{2}\)
b) \(=-\frac{49}{25}-\frac{5}{36}+\frac{4}{123}+\frac{49}{25}-\frac{4}{123}-\frac{1}{36}\)
\(=\left(-\frac{49}{25}+\frac{49}{25}\right)+\left(\frac{4}{123}-\frac{4}{123}\right)-\left(\frac{5}{36}+\frac{1}{36}\right)\)
\(=-\frac{6}{36}=-\frac{1}{6}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
100 x 25 + 85 - 25 x 10 + 123 =
2500+85-250+123
2585-250+123
2335+123
2458
123 + 25 = 148 nhe!
*** k minh nha!
Số cần tìm là:
123+25=148
Đáp số:148