求二次根式的练习题
\u4e8c\u6b21\u6839\u5f0f\u7ec3\u4e60\u989820*20=400
15*15=225
400+225=625
625\u7684\u7b97\u672f\u5e73\u65b9\u6839=25
\u7b80\u4fbf\u65b9\u6cd5:3\u30014\u30015\u4e3a\u6700\u5e38\u89c1\u7684\u52fe\u80a1\u6570\u4e4b\u4e00.
\u5f53A:B:C=3:4:5\u7684\u65f6\u5019,ABC\u4e3a\u52fe\u80a1\u6570.
\u6240\u4ee515\u300120\u300125\u4e3a\u52fe\u80a1\u6570.
\u5373\u7b54\u6848\u4e3a25
\u4f8b\u5982,6:8:10=3:4:5.\u6240\u4ee56\u30018\u300110\u4e3a\u4e00\u7ec4\u52fe\u80a1\u6570.
\u24605\u221a8-2\u221a32+\u221a50
=5*3\u221a2-2*4\u221a2+5\u221a2
=\u221a2(15-8+5)
=12\u221a2
\u2461\u221a6-\u221a3/2-\u221a2/3
=\u221a6-\u221a6/2-\u221a6/3
=\u221a6/6
\u2462(\u221a45+\u221a27)-(\u221a4/3+\u221a125)
=(3\u221a5+3\u221a3)-(2\u221a3/3+5\u221a5)
=-2\u221a5+7\u221a5/3
\u2463(\u221a4a-\u221a50b)-2(\u221ab/2+\u221a9a)
=(2\u221aa-5\u221a2b)-2(\u221a2b/2+3\u221aa)
=-4\u221aa-6\u221a2b
\u2464\u221a4x*(\u221a3x/2-\u221ax/6)
=2\u221ax(\u221a6x/2-\u221a6x/6)
=2\u221ax*(\u221a6x/3)
=2/3*|x|*\u221a6
\u2465(x\u221ay-y\u221ax)\u00f7\u221axy
=x\u221ay\u00f7\u221axy-y\u221ax\u00f7\u221axy
=\u221ax-\u221ay
\u2466(3\u221a7+2\u221a3)(2\u221a3-3\u221a7)
=(2\u221a3)^2-(3\u221a7)^2
=12-63
=-51
\u2467(\u221a32-3\u221a3)(4\u221a2+\u221a27)
=(4\u221a2-3\u221a3)(4\u221a2+3\u221a3)
=(4\u221a2)^2-(3\u221a3)^2
=32-27
=5
\u2468(3\u221a6-\u221a4)²
=(3\u221a6)^2-2*3\u221a6*\u221a4+(\u221a4)^2
=54-12\u221a6+4
=58-12\u221a6
\u2469\uff081+\u221a2-\u221a3\uff09\uff081-\u221a2+\u221a3\uff09
=[1+(\u221a2-\u221a3)][1-(\u221a2-\u221a3)]
=1-(\u221a2-\u221a3)^2
=1-(2+3+2\u221a6)
=-4-2\u221a6
3.根号2的平方乘4的平方乘3 答案是8倍根号3 4.根号24乘根号42 答案是12倍根号7 5.根号-8乘-12答案是 4倍 根号6 6. 5倍根号45乘3/2乘根号8/3 答案是 15倍根号30 7. 根号3分子根号48 答案是 4 8. 根号225分子162乘8 答案是 2.4
1.0＜a＜1，化简根号下（a-1分之a）＾2+4+根号下（a+1分之a）＾2-4
2.化简a*根号下-a+1分之a＾2
3.当x什嘛时候时，式子1-根号下x+1分之a+1有意义
问题补充：第1题：若0＜a＜1，化简根号下〔（a-a分之1）＾2+4〕+根号下〔（a+a分之1）＾2-4〕
第2题：化简：a乘以根号下（-a＾2分之a+1）
第3题：当x什嘛时候时，式子1-根号下x+1分之x-1有意义（1也在分母上）
第4题：化简：根号x-根号y分之x-y+（x+2乘以根号下xy+y）除以（根号x+根号y）
第5题：化简求值;x＾2+x-2分之x+1除以〔x-2+（x+2分之3）〕其x=（根号3）+2
求求你们了，我一会要交
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