tolong dong sama caranya yah

[tex]1. \\ bc = \sqrt{9} + \sqrt{12} \\ = \sqrt{81 + 144} \\ = \sqrt{225} \\ = 15 \\ \\ 2. \\ bc = \sqrt{13} - \sqrt{12} \\ = \sqrt{169 - 144} \\ = \sqrt{25} \\ = 5 \\ \\ 3. \\ ac = \sqrt{24} + \sqrt{7} \\ = \sqrt{576 + 49} \\ = \sqrt{625} \\ = 25 \\ \\ 4. \\ bc = \sqrt{29} - \sqrt{20} \\ = \sqrt{841 - 400} \\ = \sqrt{441} \\ = 21[/tex]
smoga membantuuu:D