(√5+2√3)(-√5+2√3)=?(2√3-1)²=?√32÷(√8+√18)=?

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(√5+2√3)(-√5+2√3)=?(2√3-1)²=?√32÷(√8+√18)=?

(√5+2√3)(-√5+2√3)=?(2√3-1)²=?√32÷(√8+√18)=?
(√5+2√3)(-√5+2√3)=?(2√3-1)²=?√32÷(√8+√18)=?

(√5+2√3)(-√5+2√3)=?(2√3-1)²=?√32÷(√8+√18)=?
(√5+2√3)(-√5+2√3)
=(2√3+√5)(2√3-√5)
= 12-5
=7
(2√3-1)²
= 12-4√3+1
=13-4√3
√32÷(√8+√18)
=√32÷(2√2+3√2)
=4√2÷5√2
= 4/5

1.用平方差,得 4*3-5=7
2.除就括号就可以了,得10/3