根据对话内容判断下列句子正误。

John：What did you do last Saturday，Mike?

Mike：On Saturday I went to the zoo．

John：Did you go there by yourself?

Mike：No．I went there with my brother．

John：What about Sunday?

Mike：I helped my mum with the housework．

John：Did you wash the clothes?

Mike：Yes．Also l cleaned the window and cooked with my mum．What about your weekend?

John：Nothing special．I just was at home and did my homework on Saturday．and I visited my grandparents on Sunday．

有这样一类题目：将$\sqrt{a\pm 2\sqrt{b}}$化简，如果你能找到两个数m、n，使m²+n²=a并且mn=$\sqrt{b}$，则将a±2$\sqrt{b}$变成m²+n²±2mn=（m±n）²开方，从而使得$\sqrt{a\pm 2\sqrt{b}}$化简．

例如：化简$\sqrt{3+2\sqrt{2}}$．

解：$\sqrt{3+2\sqrt{2}}$=$\sqrt{1+2+2\sqrt{2}}$=$\sqrt{1^2+{\left(\sqrt{2}\right)}^2+2\sqrt{2}}$=$\sqrt{{\left(1+\sqrt{2}\right)}^2}$=1+$\sqrt{2}$

根据上述材料化简下列各式：

（1）$\sqrt{4+2\sqrt{3}}$

（2）$\sqrt{12-6\sqrt{3}}$﹣$\sqrt{16-8\sqrt{3}}$．