Question

Rezolvati in multimea numerelor rationale ecuatia:
a)2/3x=46; b)1/5x-1,3=1; c)3,6:x=1,2

Answer 1

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$a) \frac{2}{3} \times x = 46 \\ \frac{3}{2} \times \frac{2}{3} \times x = \frac{3}{2} \times 46 \\ x = 3 \times 23 \\x = 69\\ \\ b) \frac{1}{5} \times x - \frac{13}{10} = 1 \\ 2x - 13 = 10 \\ 2x = 10 + 13 \\ 2x = 23 \\ \times = 11.5 \\ \\ c)3.6 \div x = 1.2 \: \: x diferit \: de \:0 \\ \frac{18}{5} \times \frac{1}{x} = 1.2 \\ \frac{18}{5 \times x} = 1.2 \\ 18 = 6 \times x \\ 6 \times x = 18 \\ x = 3$