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[tex]2\frac{1}{4}:(\frac{15}{16}-0,75)=\frac{2\cdot4+1}{4}:(\frac{15}{16}-\frac{75}{100})=\frac{8+1}{4}:(\frac{15}{16}-\frac{75:25}{100:25})=\\\\=\frac{9}{4}:(\frac{15}{16}-\frac{3}{4})=\frac{9}{4}:(\frac{15}{16}-\frac{3\cdot4}{4\cdot4})=\frac{9}{4}:(\frac{15}{16}-\frac{12}{16})=\frac{9}{4}:\frac{3}{16}=\\\\=\frac{9}{4}\cdot\frac{16}{3}=3\cdot4=12 \ (\text{skracam 9 i 3 przez 3, oraz 4 i 16 przez 4})[/tex]
