先化简,再求值:{[(X-3)÷(X+3)]+[(6X)÷(X²-9)]}

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/08 06:13:43

先化简,再求值:{[(X-3)÷(X+3)]+[(6X)÷(X²-9)]}
先化简,再求值:{[(X-3)÷(X+3)]+[(6X)÷(X²-9)]}

先化简,再求值:{[(X-3)÷(X+3)]+[(6X)÷(X²-9)]}
原式= X-3/X+3 + 6X/(X+3)(X-3)
=(X-3)^2+6X/(X+3)(X-3)
=(X+3)^2/(X+3)(X-3)
=X+3/X-3
小意思
楼上的 没算完

(x-3)/(x+3)+6x/(x^2-9)
= (x-3)^2/(x^2-9)+6x/(x^2-9)
=[(x^2-6x+9)+6x]/(x^2-9)
=(x^2+9)/(x^2-9)