(√12-√½-2√1/3)-√1/8+√18的值(精确到0.01)
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解:原式=[√12-√(1/2)-2√(1/3)]-√(1/8)+√18
=[2√3-√(2/4)-2√(3/9)]-√(2/16)+3√2
=2√3-(√2)/2-(2√3)/3-(√2)/4+3√2
=[2√3-(2√3)/3]+[3√2-(√2)/2-(√2)/4]
=(6√3-2√3)/3+(12√2-2√2-√2)/4
=(4√3)/3+(9√2)/4
=(16√3+27√2)/12
≈(16×1.73+27×1.41)/12
≈5.48
=[2√3-√(2/4)-2√(3/9)]-√(2/16)+3√2
=2√3-(√2)/2-(2√3)/3-(√2)/4+3√2
=[2√3-(2√3)/3]+[3√2-(√2)/2-(√2)/4]
=(6√3-2√3)/3+(12√2-2√2-√2)/4
=(4√3)/3+(9√2)/4
=(16√3+27√2)/12
≈(16×1.73+27×1.41)/12
≈5.48
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