九
数学上第21章二次根式-开根号、将根号外的数字或字母移到根号内-10分钟练习
基础巩固练习
1.将根号外的数字移到根号内
2Eg:2,3,4,3,4,3,122= 3
2-2=,2,3,,4,3,,4,3,,12 3
(1)2= 5
(2)-2 7,
(3)3 2,
(4)3 5,
(5)3 7,
(6)-4 3,
(7)4 5,
(8)-4 7,
(9) 5 2,
(10) 5 3,
(11)5 5,
(12)-57, (13)62, (14)-63, (15)65= (16)-67, (17)2 13,(18)-4 15,(19)5 17,
2,(20)-13
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基础巩固练习
2.化简。
2Eg:12,4,3,4,3,2,3,23
(1)- 8,(2) 18,(3)- 24,(4) 28,(5)- 32,(6)44,
(7)48,
(8)52,
(9)56,
(10)63,(11)68,(12)72,(13)75,(14)80,(15)84,(16)88,(17)92,(18)98,(19)112,
(20)126,(21)164,
(22)189,(23)216,
(24)242,
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基础巩固练习
3.化简。
2Eg:当1?x<5时,化简。 ,,x,1,x,5
?1,x,5
解: ?x,1,0,x,5,0
2,,,,x,1,x,5,x,1,x,5,x,1,x,5,4
2,,,,(1)x,2,x,52,x,5
(3)2x,6,4,x,5,x,3,,
1,,22,,xxx(2)2,1,,3,,3,,,,(4)x,2x,1x,12,,
1,,2(5)4x,4x,1x,,,2,,
31,,,,22,,xxx(6)2,3,,2,,2,,xxx(7)1,4,2,,,2,,,,24,,,,
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