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=2/5(-3/7-5/14)-18/35
=2/5x(-11/14)-18/35
=-22/70-18/35=-29/35
![](https://rs.olm.vn/images/avt/0.png?1311)
Gọi số đó là a
Ta có:
\(\left\{\left[\left(8a+1\right)\frac{4}{7}+\frac{1}{2}\right]-\frac{1}{2}\right\}:3+\frac{1}{2}=0,6\)
\(\left\{\left[\left(8a+1\right)\frac{4}{7}+\frac{1}{2}\right]-\frac{1}{2}\right\}:3=\frac{1}{5}\)
\(\left[\left(8a+1\right)\frac{4}{7}+\frac{1}{2}\right]-\frac{1}{2}=\frac{1}{15}\)
\(\left(8a+1\right)\frac{4}{7}+\frac{1}{2}=\frac{17}{30}\)
\(\left(8a+1\right)\frac{4}{7}=\frac{1}{15}\)
\(8a+1=\frac{7}{45}\)
\(8a=\frac{-38}{45}\)
\(a=\frac{-19}{180}\)
\(\left\{\left[\left(8a+1\right)\frac{4}{7}+\frac{1}{2}\right]-\frac{1}{2}\right\}:3=\frac{1}{5}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(5^2.2^3-7^3.2\right):\left(2.6-7:2^5\right)\\ =\left(25.8-343.2\right):\left(12-7:32\right)\\ =\left(200-686\right):\left(12-\dfrac{7}{32}\right)\\ =-486:\dfrac{377}{32}=-486.\dfrac{32}{377}=-\dfrac{15552}{377}\)
(5^2*2^3-7^3*2):2*6-7:2^5
=(25*8-343*2):3-7/32
=-162-7/32=-5191/32
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\(\left(\left(x-\frac{1}{2}\right).\frac{1}{3}-\frac{1}{2}\right).\frac{1}{3}-\frac{1}{2}=0\)
\(\left(\left(x-\frac{1}{2}\right).\frac{1}{3}-\frac{1}{2}\right).\frac{1}{3}=\frac{1}{2}\)
\(\left(\left(x-\frac{1}{2}\right).\frac{1}{3}-\frac{1}{2}\right)=\frac{3}{2}\)
\(\left(x-\frac{1}{2}\right).\frac{1}{3}=2\)
\(x-\frac{1}{2}=6\)
\(x=6+\frac{1}{2}=\frac{13}{2}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Gọi x là số nguyên bất kì
Ta có: \(x-7.2-2x=14-x\)
Vậy kết quả cuối cùng là 14 - x ( kết quả phụ thuộc vào x )
![](https://rs.olm.vn/images/avt/0.png?1311)
Tính ngược lại , ta có :
0+1/2 = 1/2 : 1/3 = 3/2 + 1/2 = 2 : 1/3 = 6 + 1/2 =13/2
Vậy số An nghĩ là : 13/2
![](https://rs.olm.vn/images/avt/0.png?1311)
Từ đề bài ta sẽ có biểu thức:( x*5-8)/3=14. Ta sẽ tìm x như sau
(x*5-8)/3=14
x*5-8=14*3
x*5-8=42
x*5=42+8
x*5=50
x=50/5=10
= \(\frac{2}{3}\)- \(\frac{2}{5}\)
= \(\frac{4}{15}\)
# Hok tốt !
2/5 nhé