daca a=3/8 si b= 2/3 aflati 4ab -1 (explicație pls)​

[tex]a = \frac{3}{8} \\ b = \frac{2}{3} [/tex]

[tex]4ab - 1 = 4 \times (a \times b) - 1[/tex]

[tex]4 \times ( \frac{3}{8} \times \frac{2}{3} ) - 1[/tex]

[tex]4 \times \frac{6}{24} - 1[/tex]

[tex] \frac{4}{1} \times \frac{6}{24} - 1 [/tex]

[tex] \frac{24}{24} - 1 \\ = > 1 - 1 = 0[/tex]

4ab-1= 4 * a * b - 1 = 4 * 3/8 * 2/3 - 1= 12/8 * 2/3 - 1 (simplificam 12 cu 3 si 8 cu 2) = 4/4 - 1 = 1-1=0