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| x + 4/15 | - | - 3,75 | = - | - 2,15 |
| x + 4/15 | - 3,75 = - 2,15
| x + 4/15 | = - 2,15 + 3,75
| x + 4/15 | = 1,6
Trường hợp 1 : x + 4/15 = 1,6 suy ra x = 4/3
Trương hợp 2: x + 4/15 = - 1,6 suy ra x = -28/15
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left|x+\frac{4}{15}\right|-\left|-3,75\right|=-\left|-2,15\right|\)
\(\Rightarrow\left|x+\frac{4}{15}\right|-3,75=-2,15\)
\(\Rightarrow\left|x+\frac{4}{15}\right|=-2,15+3,75\)
\(\Rightarrow\left|x+\frac{4}{15}\right|=1,6\)
\(\Rightarrow\left|x+\frac{4}{15}\right|=\frac{8}{5}\)
\(\Rightarrow\left[\begin{array}{nghiempt}x+\frac{4}{15}=\frac{8}{5}\\x+\frac{4}{15}=-\frac{8}{5}\end{array}\right.\)
\(\Rightarrow\left[\begin{array}{nghiempt}x=\frac{4}{3}\\x=-\frac{28}{15}\end{array}\right.\)
Ta có : \(\left|x+\frac{4}{15}\right|-\left|-3,75\right|=-\left|-2,15\right|\)
\(\Leftrightarrow\left|x+\frac{4}{15}\right|=3,75-2,15=\frac{8}{5}\)
\(\Rightarrow\left[\begin{array}{nghiempt}x+\frac{4}{15}=\frac{8}{5}\\-x-\frac{4}{15}=\frac{8}{5}\end{array}\right.\)
\(\Leftrightarrow\left[\begin{array}{nghiempt}x=\frac{4}{3}\\x=-\frac{28}{15}\end{array}\right.\)
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12,48: 0,5 \(\times\) 6,25 \(\times\) 4 \(\times\) 2
= 12,48 \(\times\) 2 \(\times\) 2 \(\times\) (6,25 \(\times\) 4)
= 12,48 \(\times\)4 \(\times\) 25
= 12,48 \(\times\) 100
= 1248
12,48:0,5x6,25x4x2=24,96x6,25x4x2=24,96x(6,25x4x2)
=(24,96x100):2
=2496:2=1248
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2,1 x 3,75 =X x (0,05+3,7)
2,1 x 3,75 =X x 3,75
X x 3,75 = 2,1 x 3,75
X x 3,75 = 7,875
X = 7,875 : 3,75
X = 2,1
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Nhận thấy \(3,75-2,5\times1,5=3,75-3,75=0\)
NÊN A =\(\left(1995;0,25+1996;4\right)\times2010\times2011\times0\)
Vậy A = \(0\)
A= (1995 : 0,25 + 1996 : 4) . 2010 . 2011 . (3,75 - 2,5 . 1,5)
A=(1995 : 0,25 = 1996 : 4) . 2010 . 2011 . (3,75 - 3,75)
A=(1995 : 0,25 = 1996 : 4) . 2010 . 2011 . 0
A= 0
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\(\dfrac{7011}{25}:\left(x-42.6\right).15=13\)
\(\Rightarrow\dfrac{7011}{\dfrac{25}{\left(x-42,6\right)}}.0,15=13\)
\(\Rightarrow\dfrac{280,44}{\left(x-42,6\right)}.0,15=13\)
\(x-\left(280,44-42,6\right)\)
\(x=237.8+86,7\)
\(x=324,54\)
\(\)Vậy x=324,54
b.
\(7,2-\left(x+3,75:2,1\right):1,9=5,2\)
\(\Rightarrow7,2+\dfrac{-\left(x-\dfrac{3,75}{2,1}\right)}{1,9}=5,2\)
\(7,2+\dfrac{-\left(x-1,8\right)}{1,9}=5,2\)
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x^4=6.25^2
\(\Leftrightarrow\)x=\(\sqrt{6.25}\)
\(\Leftrightarrow\)x=-2.5
x.(3,75+6,25)=30
x.10=30
x=30:10
x=3