当X=根号2-2时,求(X²-1)(2/X-1 +1/X+1)的值当x=√2-2 时,求(x²-1)(x-1分之2 + x+1分之1)的值
来源:学生作业帮助网 编辑:六六作业网 时间:2024/11/24 20:52:02
当X=根号2-2时,求(X²-1)(2/X-1+1/X+1)的值当x=√2-2时,求(x²-1)(x-1分之2+x+1分之1)的值当X=根号2-2时,求(X²-1)(2/
当X=根号2-2时,求(X²-1)(2/X-1 +1/X+1)的值当x=√2-2 时,求(x²-1)(x-1分之2 + x+1分之1)的值
当X=根号2-2时,求(X²-1)(2/X-1 +1/X+1)的值
当x=√2-2 时,求(x²-1)(x-1分之2 + x+1分之1)的值
当X=根号2-2时,求(X²-1)(2/X-1 +1/X+1)的值当x=√2-2 时,求(x²-1)(x-1分之2 + x+1分之1)的值
答:
(x^2-1)*[2/(x-1)+1/(x+1)]
=(x^2-1)*[2(x+1)/(x^2-1)+(x-1)/(x^2-1)]
=(x^2-1)*(2x+2+x-1)/(x^2-1)
=3x+1
=3(√2-2)+1
=3√2-5
2/(x-1) 1/(x+1)对吗?
(X²-1)[2/(X-1 )+1/(X+1)]=(X²-1)[2x+2+x-1]/(X²-1)=3x+1=3根号2-6+1=3根号2-5