计算题,两部答案就好1.(√2-√12)(√18+√48)2.(1/2√3+√8)(√8-1/2√3)
3.(√3-1)的平方-(2√3)的平方4.√48/√3-√1/2*√12+√245.√5+1/√5-√4/5快速!!!!!!!!!!!!...
3.(√3-1)的平方-(2√3)的平方 4. √48/√3-√1/2*√12+√24 5. √5+1/√5-√4/5
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快速!!!!!!!!!!!! 展开
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1.(√2-√12)(√18+√48)
=(√2-2√3)(3√2+4√3)
=6+4√6-6√6-24
=-18-2√6
2.(1/2√3+√8)(√8-1/2√3)
=.(√8+1/2√3)(√8-1/2√3)
=(√8)²-(1/2√3)²
=8-1/12
=7又11/12
3.(√3-1)²-(2√3)²
=3-2√3+1-12
=-8-2√3
4.√48/√3-√1/2*√12+√24
=√16-√6+2√6
=4+√6
5.√5+1/√5-√4/5
=√5+1/√5-2/√5
=√5-1/√5
=5/√5-1/√5
=4/√5
=(√2-2√3)(3√2+4√3)
=6+4√6-6√6-24
=-18-2√6
2.(1/2√3+√8)(√8-1/2√3)
=.(√8+1/2√3)(√8-1/2√3)
=(√8)²-(1/2√3)²
=8-1/12
=7又11/12
3.(√3-1)²-(2√3)²
=3-2√3+1-12
=-8-2√3
4.√48/√3-√1/2*√12+√24
=√16-√6+2√6
=4+√6
5.√5+1/√5-√4/5
=√5+1/√5-2/√5
=√5-1/√5
=5/√5-1/√5
=4/√5
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