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calculați 12x/3 - 6x/2, x+x*√25+4x/2, 20x^2:10x, 5x/2-x/4, 20x/7-2x/21​

Răspuns :

Răspuns:

  1. [tex] \frac{12x}{3} - \frac{6x}{2} = 4x - 3x = x[/tex]
  2. [tex]x + x \times \sqrt{25} + \frac{4x}{2} = x + x \times 5 + 2x = \\ x + 5x + 2x = 8x[/tex]
  3. [tex]20x^{2} \div 10x = 2 {x}^{2} \times x = 2 {x}^{3} [/tex]
  4. [tex] \frac{5x}{2} - \frac{x}{4} = \frac{10x}{4} - \frac{x}{4} = \frac{9x}{4} = > \frac{9}{4} x[/tex]
  5. [tex] \frac{20x}{7} - \frac{2x}{21} = \frac{60x}{21} - \frac{2x}{21} = \frac{58x}{21} = > \frac{58}{21} x[/tex]