tolong dibantu nomor 10,11,12 pada gambar ,

10.
[tex] \frac{5m + 6}{4} - \frac{2m - 7}{6} = \frac{15m + 18}{12} - \frac{4m - 14}{12} \\ = \frac{15m + ( - 4m) + 18 - 14}{12} \\ = \frac{11m + 4}{12} [/tex]

11.
[tex] \frac{9}{5x} - \frac{4}{7x} = \frac{63}{35x} - \frac{20}{35x} \\ = \frac{63 - 20}{35x} = \frac{43}{35x} [/tex]
12.
[tex] \frac{k {}^{2} {m}^{3}n }{4m} \div \frac{kn}{12} = \frac{k {}^{2} {m}^{3}n}{4m} \times \frac{12}{kn} \\ = \frac{12k {}^{2} {m}^{3}n}{4kmn} = 3km {}^{2} [/tex]