(3√7+2倍√3)(2√3-3倍√7);(√32-3倍√3)(4√2+√27);要过程!!谢谢!!
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(3√7+2√3)(2√3-3√7)
=(2√3+3√7)(2√3-3√7)
=(2√3)^2-(3√7)^2
=12-63
=-51
(√32-3√3)(4√2+√27)
=(4√2-3√3)(4√2+3√3)
=(4√2)^2-(3√3)^2
=32-27
=5
(3√6-√4)^2
=(3√6)^2-2*3√6*√4+(√4)^2
=54-(6√24)+4
=58-12√6
(1+√2-√3)(1-√2+√3)
=[1+(√2-√3)][1-(√2-√3)]
=1^2-(√2-√3)^2
1-[(√2)^2-2((√2)(√3)+(√3)^2]
=1-[2-(2√6)+3]
=2√6-4
=(2√3+3√7)(2√3-3√7)
=(2√3)^2-(3√7)^2
=12-63
=-51
(√32-3√3)(4√2+√27)
=(4√2-3√3)(4√2+3√3)
=(4√2)^2-(3√3)^2
=32-27
=5
(3√6-√4)^2
=(3√6)^2-2*3√6*√4+(√4)^2
=54-(6√24)+4
=58-12√6
(1+√2-√3)(1-√2+√3)
=[1+(√2-√3)][1-(√2-√3)]
=1^2-(√2-√3)^2
1-[(√2)^2-2((√2)(√3)+(√3)^2]
=1-[2-(2√6)+3]
=2√6-4
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