tolong dong kak.....

a.)

[tex] \frac{2a - 1}{3} + \frac{3a + 2}{4} \\ = \frac{4(2a - 1) + 3(3a + 2)}{3 \times 4} \\ = \frac{8 a - 4 + 9a + 6}{12} \\ = \frac{ 8a + 9a - 4 + 6}{12} \\ = \frac{17a + 2}{12} [/tex]

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b.)

[tex] \frac{3}{2y} - \frac{4}{5y} \\ = \frac{3 \times 5y - 4 \times 2y}{2y \times 5y} \\ = \frac{ 15y - 8y}{10y {}^{2} } \\ = \frac{7y}{10y {}^{2} } \\ = \frac{7 \times y}{10 \times y \times y} \\ = \frac{7}{10y} [/tex]