Evident, nu le voi face pe toate. Uite modul de lucru:
h)
[tex] \frac{2}{3} x - 1 = 1.(3) \\ \frac{2x}{3} - 1 = \frac{13 - 1}{9} \\ \frac{2x - 3}{3} = \frac{4}{3} \\ 2x - 3 = 4 \\ 2x = 7 \\ x = \frac{7}{2} [/tex]
k)
[tex]5x \div 3 \frac{1}{8} = 0.25 \\ 5x \div \frac{3 \times 8 + 1}{8} = \frac{25}{100} \\ 5x \div \frac{25}{8} = \frac{1}{4} \\ 5x \times \frac{8}{25} = \frac{1}{4} \\ \frac{8x}{5} = \frac{1}{4} \\ \frac{32x}{20} = \frac{5}{20} \\ 32x = 5 \\ x = \frac{5}{32} [/tex]
l)
[tex] \frac{5}{6} x \div 1 \frac{1}{2} = 0.25 \\ \frac{5x}{6} \div \frac{3}{2} = \frac{1}{4} \\ \frac{5x}{6} = \frac{1}{4} \times \frac{3}{2} \\ \frac{5x}{6} = \frac{3}{8} \\ 40x = 18 \\ x = \frac{18}{40} = \frac{9}{20} [/tex]
m)
Acest ex il voi face in 2 moduri
[tex] \frac{11}{15} \div x = \frac{22}{5} \\ \frac{11}{15} = \frac{22}{5} \times x \\ \frac{11}{15} = \frac{22x}{5} \\55 = 330x \\ x = \frac{1}{6} [/tex]
[tex] \frac{11}{15} \div x = \frac{22}{5} \\ \frac{11}{15} \times \frac{1}{x} = \frac{22}{5} \\ \frac{11}{15x} = \frac{22}{5} \\ \frac{11}{15x} = \frac{66x}{15x} \\ 66x = 11 \\ x = \frac{1}{6} [/tex]
