1、根号(1/7)
2、根号(1/5+1/6)
3、1/根号2
4、根号5/根号40
5、根号(9y/8x)
6、1/(20根号5)
7、(2+根号2)/根号2
求解答 求过程 QAQ QUQ QWQ
çï¼
1ãæ ¹å·ï¼1/7ï¼=â7 /7
2ãæ ¹å·ï¼1/5+1/6ï¼
=â(6/30+5/30)
=â(11/30)
=â330 /30
3ã1/æ ¹å·2
=1/â2
=â2 /2
4ãæ ¹å·5/æ ¹å·40
=â5/â40
=â(5/40)
=â(1/8)
=â(2/16)
=â2 /4
5ãæ ¹å·ï¼9y/8xï¼
=â(9y/8x)
=â[9*2xy / (16x^2) ]
=[ 3â(2xy)] /(4|x|)
6ã1/ï¼20æ ¹å·5ï¼
=1/(20â5)
=â5 /100
7ãï¼2+æ ¹å·2ï¼/æ ¹å·2
=(2+â2) /â2
=â2 +1
1ãæ ¹å·ï¼1/7ï¼=â7 /7
2ãæ ¹å·ï¼1/5+1/6ï¼
=â(6/30+5/30)
=â(11/30)
=â330 /30
3ã1/æ ¹å·2
=1/â2
=â2 /2
4ãæ ¹å·5/æ ¹å·40
=â5/â40
=â(5/40)
=â(1/8)
=â(2/16)
=â2 /4
5ãæ ¹å·ï¼9y/8xï¼
=â(9y/8x)
=â[9*2xy / (16x^2) ]
=[ 3â(2xy)] /(4|x|)
6ã1/ï¼20æ ¹å·5ï¼
=1/(20â5)
=â5 /100
7ãï¼2+æ ¹å·2ï¼/æ ¹å·2
=(2+â2) /â2
=â2 +1
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第1个回答 2014-06-19
1.√3/5*√12/5=√36/25=6/5
2.√3/4*√8/27=√3*8/4*27=√2/3
3.5√45*3/2√8/3=√25*45*9/4*8/3=15√30
4.√3(√18+√75)=√3*18+√3*75=3√6+15
5.(7√xy-3√yz)*(7√xy+3√yz)=49xy-9yz
6.(√5-√6)^201(√5+√6)^201=(5-6)^201=-1
7.(2√5-3)^2=(2√5)^2-2*2√5*3+9=29-4√5
8.√26+8/9=√26*9+8/9=11/3√2
9.√7/16y^2=√7/|4y|
10.√81c/a^b=9/(a^b/2)√c追问
2.√3/4*√8/27=√3*8/4*27=√2/3
3.5√45*3/2√8/3=√25*45*9/4*8/3=15√30
4.√3(√18+√75)=√3*18+√3*75=3√6+15
5.(7√xy-3√yz)*(7√xy+3√yz)=49xy-9yz
6.(√5-√6)^201(√5+√6)^201=(5-6)^201=-1
7.(2√5-3)^2=(2√5)^2-2*2√5*3+9=29-4√5
8.√26+8/9=√26*9+8/9=11/3√2
9.√7/16y^2=√7/|4y|
10.√81c/a^b=9/(a^b/2)√c追问
不对嘛。。。你不会就不要回答 ,,