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b)(4√5+√3)(4√5-√3)=(4√5)²-(√3)²=80-3=77
c)(√8+2√6)(2√6-√8)=24-8=16
d)(√6-3√3)²=6-2*√6*3√3+27=33-6√18=33-18√2
e)(2√32-3√2)²=128-2*2√32*3√2+18=146-12√64=146-96=50