初二数学!急急急
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√18+4√0.5-6√(1/8)
=3√2+2√(0.5×2²)-6/(2√2)
=3√2+2√2-3/√2
=3√2+2√2-(3/2)√2
=(7/2)√2
(3/2)√(2/3)-[(5/2)√(1+4/9)+3√(1/6)]
= (3/2)√6/3-(5/2)√(1+4/9)-3√(1/6)
=√6/2- (5/2)√13/3-3/√6
=√6/2- (5/6)√13-3×√6/6
= - (5/6)√13
(a-2√b)²-(a+2√b)²
=[(a-2√b)+( a+2√b)][(a-2√b)-(a+2√b)
=2a●(-4√b)
=-8a√b
=3√2+2√(0.5×2²)-6/(2√2)
=3√2+2√2-3/√2
=3√2+2√2-(3/2)√2
=(7/2)√2
(3/2)√(2/3)-[(5/2)√(1+4/9)+3√(1/6)]
= (3/2)√6/3-(5/2)√(1+4/9)-3√(1/6)
=√6/2- (5/2)√13/3-3/√6
=√6/2- (5/6)√13-3×√6/6
= - (5/6)√13
(a-2√b)²-(a+2√b)²
=[(a-2√b)+( a+2√b)][(a-2√b)-(a+2√b)
=2a●(-4√b)
=-8a√b
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