先化简,再求值:{[(X-3)÷(X+3)]+[(6X)÷(X²-9)]}

问题描述:

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