(根号8+根号48)乘以(跟号2-根号12)-(根号3-根号2)^2
=(√8+√48)*(√2-√12)-(√3-√2)^2
=(2√2+4√3)*(√2-2√3)-(√3-√2)^2
=2*(√2+2√3)*(√2-2√3)-(√3-√2)^2
=2*(2-4*3)-(3-2√6+2)
=2*(-10)-(5-2√6)
=-20-5+2√6
=2√6-25
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