Y=x+1/x-3 算到值域中Y=x+1/x-3=(1+4/x-3) 括号部分怎么算出来的,急
2个回答
Y=(x+1)/(x-3)
=(x-3+4)/(x-3)
=(x-3)/(x-3)+4/(x-3)
=1+4/(x-3)
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