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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(3,45\times x+6,55\times x=2,5\)
\(\left(3,45+6,55\right)\times x=2,5\)
\(10\times x=2,5\)
x = 0 , 25
\(3,45\times x+6,55\times x=2,5\)
\(x\times\left(3,45+6,55\right)=2,5\)
\(x\times10=2,5\)
\(x=2,5:10\)
\(x=0,25\)
![](https://rs.olm.vn/images/avt/0.png?1311)
x . 8,6 = 387
<=> x = 45
Vậy x = 45
x + 2,7 = 10,8
<=> x = 8,1
Vậy x = 8,1
x : 3,45 = 6,7
<=> x = 23,115
Vậy............
Mấy cái còn lại tương tự
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\text{a)4,38-19+0,62}\)\(=-14\)
\(b.3,45-5,7+8,55=6,3\)
\(c.14,7+\left(-8,4\right)+\left(-4,7\right)=1.6\)
2.
\(a,-2,4-\left(0,54-2,5\right)=-0,44\)
\(b,-25,4-\left(5,54-2,5\right)=-28,44\)
\(c.2,15-\left(-0,6+0,12\right)=2.63\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
bạn r4a nhiều quá, ra từng câu rồi mọi người trả lời cho
![](https://rs.olm.vn/images/avt/0.png?1311)
\(A=\frac{4,25\left(x+41,53\right)-125}{\left(3,45+6,55\right):0,1}=\frac{\frac{17}{4}x.+4,25.41,53-125}{10:0,1}\)
\(A=\frac{\frac{17}{4}x+\frac{20601}{400}}{100}\)
Khi x = 58,47
\(A=\frac{\frac{17}{4}.56,47+\frac{20601}{400}}{100}=\frac{588}{200}=2,915\)
b) Với A = 0,535
\(A=\frac{\frac{17}{4}x+\frac{20601}{400}}{100}=0,535\)
\(\frac{17}{4}x=\frac{107}{2}-\frac{20601}{400}=\frac{799}{400}\)
=> x = \(\frac{47}{100}=0,47\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\dfrac{x}{2}+\dfrac{1,25}{0,25}=\dfrac{3,45}{0,2}\)
\(\Rightarrow\dfrac{x}{2}=\dfrac{3,45}{0,2}-\dfrac{1,25}{0,25}=\dfrac{49}{4}\)
\(\Rightarrow x=\dfrac{49.2}{4}=\dfrac{49}{2}\)
Vậy : .............
![](https://rs.olm.vn/images/avt/0.png?1311)
minh sory nha chu cia la minh viet thieu phai la chu chia moi dung
\(3,45.3,2+3,45+3,45+3,45.4,8\)
\(=3,45\left(3,2+1+1+4,8\right)\)
\(=3,45.10\)
\(=34,5\)
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