Question

先化简再求值， (x-2- x+2分之5)除以2x+4分之x-3,其中x=根号2-3 怎么算，要过程

数学计算题，

Answer 1

(x-2 - 5/(x+2) ) / ((x-3)/(2x+4))分子分母同乘(x+2)�0�2((x-2)(x+2) - 5) / �0�2((x-3)/2)2(x^2 - 9) / (x-3)2(x-3)(x+3)/(x-3)2(x+3)2(√2 -3 + 3 )2√2

Answer 2

[(x-2)-5/(x+2)]/[(x-3)/(2x+4)=[(x^2-9)/(x+2)]*[2(x+2)/(x-3)]=2(x+3)=2√2