二次根式作业题 1 .1 )化简 35 解:625511 0235222 2 )化简 3535 解: 设3535x 则22( 3535 )352353535641 0x ,01 0xx 2 .化简 3622226 解: 36 - 22(36 - 22 )(- 226 )226( 226 )(- 226 )-633 64 -83 2 4 - 24 0 -1 43 2 22 0 -73 1 1 3 .化简 aa 解:0aaaa 22222222222222211111011.2111111111]1211111111[]1211( 11)112122 111121111xxxxxxxxxxxxxxxxxxxxxxxxxxx +--+ -4.当 时,化简(+)+-+-+-++-+-解:原式=[-+-(1+-)+( +-)-+--+--+- 322aabababa>0,b>0.aaababaab( ab)( ab)[]a( ab)abaaa()abaaaba3(2)ab3(2)ab3baabbabaabbaababbbabb3-1332+--5.已知:化简() (- ).3-+3-- +解:原式=-+2+32 +32 +2 +2 + 3333333323332333663316*.232.2 1122 12122 122121212124281.414,2112223221.yyyy 设是与+最接近的整数求-的值-解:因为+--+-而因此与最接近的整数是,故与最接近的整数是,将代入,得- 7*.分解因式3(2)1xaxa 3222222221[(1)] (1)(1)(1 1)111(1)[21]22215(1)[()]2415(1)[()]221515(1)()()2222xaxxxax xaxaxaxx aaaaxaxxaaxaxaaxaxaaaaxaxx 解:原式1515(1)()()22aaaaxaxx 8*.3892,3, 8,9 中最大的数是 ,次大的数是 . 366882 452 4392 439821 685 1 222 4 3339解: 221249 ...24xxxxaaxxx已知:求:的值 22222211122114244110 ,0 ,011114,.11xaxaxaaaaxxxaaaaxaxaaaaaaaaaxxaaaaaaaa解:将两边平方得 = + - ,即+ ,所以( + )-( + )-( - )由条件知则,所以,于是,则所以原式 1 0 *.解方程:22221 21 21 2.xxxx 2222422...