4根号6-4根号1/2+3根号8
=4√6-4√(1/2)+3√8
=4√6-4√(2/4)+3×√4×√2
=4√6-4×√2×√(1/4)+3×2×√2
=4√6-4×√2×1/2+6√2
=4√6-2√2+6√2
=4√6+4√2
2根号12×根号3/4÷3根号2
=2√12×√(3/4)÷3√2
=(2÷3)×√(12×3/4÷2)
=(2/3)×√(9/2)
=(2/3)×√9×√(1/2)
=(2/3)×3×√(2/4)
=2×√2×√(1/4)
=2√2×1/2
=√2
(根号2+1)²(2根号2-3)
=(√2+1)²(2√2-3)
=(√2²+2√2+1²)(2√2-3)
=(2√2+3)(2√2-3)
=(2√2)²-3²
=8-9
=-1