二次根式计算：
展开全部
(1)
√5/√10
=√2√3 / √2√5
=√3/√5
=√15/5
(2)
(√5-5)/√5
=√5(√5-5)/5
=5(1-√5)/5
=1-√5
(3)
√45÷3(√(1/5)) × (3/2)√5
=3√5÷3(√5/5) ×3√5/2
=√5 × 5/√5 × 3√5/2
=15√5/2
(4)
(-4/3)√18÷2√8 ×(1/3)√54
=(-4/3)×9√2 ÷ 4√2 × (1/3) × 3√6
= -12÷ 4 × 3√6
= -9√6
√5/√10
=√2√3 / √2√5
=√3/√5
=√15/5
(2)
(√5-5)/√5
=√5(√5-5)/5
=5(1-√5)/5
=1-√5
(3)
√45÷3(√(1/5)) × (3/2)√5
=3√5÷3(√5/5) ×3√5/2
=√5 × 5/√5 × 3√5/2
=15√5/2
(4)
(-4/3)√18÷2√8 ×(1/3)√54
=(-4/3)×9√2 ÷ 4√2 × (1/3) × 3√6
= -12÷ 4 × 3√6
= -9√6
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