来源:学生作业帮 编辑:大师作文网作业帮 分类:数学作业 时间:2024/11/13 17:10:54
1.2.3.4题不用解答
1、(1)、原式=2倍根号2-2+3倍根号2=5倍根号2-2;
(2)、原式=4倍根号2*(9倍根号2+根号2-2倍根号2)=4倍根号2*8倍根号2=32*2=64;
2、(1)、原式=(x-1)/x*x/(x^2-1)=1/(x+1)=1/(根号2+1)=根号2-1;
(2)、原式=(x+y-x+y)/(x+y)(x-y)*(x-y)^2/2y=(x-y)/(x+y)=
(1+根号2-1+根号2)/(1+根号2+1-根号2)=2倍根号2/2=根号2;