√12÷（1/√2+1/√3）
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解: √12÷(1/√2+1/√3)
=√12÷(√3/6+√2/6)
=√12÷(√1/2+√1/3)
=√12/(√5/6)
=√12X√6/5
=√(12X6/5)
=√(72/5)
=√14.4
=√4²x0.9
=4√0.9
=√12÷(√3/6+√2/6)
=√12÷(√1/2+√1/3)
=√12/(√5/6)
=√12X√6/5
=√(12X6/5)
=√(72/5)
=√14.4
=√4²x0.9
=4√0.9
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