Tìm x, biết
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DANG 2. TÌM X.
Câu 2. Tìm x, biết
1. \( 15 \div 8 - 1 \div 8 \left( x - 0,5 \right) = \frac{5}{4} \)
2. \( \frac{3}{4} : \frac{1}{5} = -\frac{1}{4} \)
3. \( -2x = \frac{2}{3} \left( \frac{3}{4} - 1 \div 8 \cdot x \right) = \left(-\frac{1}{2}\right)^3 \)
4. \( (3x + 2)(5 - x^2) = 0 \)
5. \( |x - 1| - \left| 2 - \frac{3}{4} \right| = 2 \)
6. \( |x - 2| - \frac{1}{5} = 1 \)
7. \( |x - 2| - |1 - 2x| = 0 \)
8. \( \frac{1}{12} - \frac{4}{21} = \frac{1}{2} (3x - 2) \)
9. \( 8 \div (x - 5) = \frac{3}{x + 1} \) (với \( x \neq 5; -1 \))
10. \( x - 1 = \frac{4}{5} \) (với \( x \neq 2 \)).
11. \( x - \frac{2}{9} = \left( \frac{8}{27} \right)^3 \)
12. \( 2 \cdot 3^{-405} = 3^{-1} \)
13. \( \left( \frac{3}{4} \right)^3 = \frac{2^8}{3^4} \)
14. \( (5x + 1)^2 = \frac{36}{49} \)
15. \( \left[ (-0,5) \right]^3 = \frac{1}{64} \)
DANG 2. TÌM X.
Câu 2. Tìm x, biết
1. \( 15 \div 8 - 1 \div 8 \left( x - 0,5 \right) = \frac{5}{4} \)
2. \( \frac{3}{4} : \frac{1}{5} = -\frac{1}{4} \)
3. \( -2x = \frac{2}{3} \left( \frac{3}{4} - 1 \div 8 \cdot x \right) = \left(-\frac{1}{2}\right)^3 \)
4. \( (3x + 2)(5 - x^2) = 0 \)
5. \( |x - 1| - \left| 2 - \frac{3}{4} \right| = 2 \)
6. \( |x - 2| - \frac{1}{5} = 1 \)
7. \( |x - 2| - |1 - 2x| = 0 \)
8. \( \frac{1}{12} - \frac{4}{21} = \frac{1}{2} (3x - 2) \)
9. \( 8 \div (x - 5) = \frac{3}{x + 1} \) (với \( x \neq 5; -1 \))
10. \( x - 1 = \frac{4}{5} \) (với \( x \neq 2 \)).
11. \( x - \frac{2}{9} = \left( \frac{8}{27} \right)^3 \)
12. \( 2 \cdot 3^{-405} = 3^{-1} \)
13. \( \left( \frac{3}{4} \right)^3 = \frac{2^8}{3^4} \)
14. \( (5x + 1)^2 = \frac{36}{49} \)
15. \( \left[ (-0,5) \right]^3 = \frac{1}{64} \)