题目 下列运算错误的是((( ))) A.2+3=5\sqrt {2}+ \sqrt {3}= \sqrt {5}2+3=5B.2⋅3=6\sqrt {2}\cdot \sqrt {3}= \sqrt {6}2⋅3=6C.6÷2=3\sqrt {6}÷ \sqrt {2}= \sqrt {3}6÷2=3D.(−2)2=2(- \sqrt {2})^{2}=2(−2)2=2知识点：二次根式的混合运算章节：未标注
