Đáp án:
Giải thích các bước giải:
a) `3\sqrt{2}-4\sqrt{18}+\sqrt{32}-\sqrt{50}`
`=3\sqrt{2}-4\sqrt{9.2}+\sqrt{16.2}-\sqrt{25.2}`
`=3\sqrt{2}-4\sqrt{9}.\sqrt{2}+\sqrt{16}.\sqrt{2}-\sqrt{25}.\sqrt{2}`
`=3\sqrt{2}-12\sqrt{2}+4\sqrt{2}-5\sqrt{2}`
`=-10\sqrt{2}`
b) `3/2.\sqrt{6}+2.\sqrt{\frac{2}{3}}-4.\sqrt{\frac{3}{2}}`
`=3/2.\sqrt{6}+\sqrt{(2)^2 . \frac{2}{3}}-\sqrt{(4)^2 . \frac{3}{2}}`
`= 3/2.\sqrt{6}+\sqrt{4 . \frac{2}{3}}-\sqrt{16 . \frac{3}{2}}`
`=3/2.\sqrt{6}+2/3\sqrt{6}-2\sqrt{6}`
`=\frac{\sqrt{6}}{6}`
