minta bantuin no 1 2 3

1. [tex] 1.27^{ \frac{2}{3} } = 3^{3 \frac{2}{3} } = 3^{2} =9.a 2.\sqrt{128}-2 \sqrt{72} +3 \sqrt{98}= \sqrt{64x2} -2 \sqrt{36x2}+ 3\sqrt{49x2} = 8 \sqrt{2} - 2x6 \sqrt{2} +3x7 \sqrt{2} = 8 \sqrt{2}- 12\sqrt{2}+ 21\sqrt{2} = 17\sqrt{2}.d [/tex]
maaf no 3 susah di ketik