问题描述：
英语翻译
1.determine whether or not the given function has the set of all real numbers as its domain :f(t)=根号下(1-x)
2.determine the domain of the given function:f(x)=X的三次方-3x的平方+2x+5
3.find the difference quotient of f; namely,[f(x+h)-f(x)]/h :f(x)=2x+3
4.find the indicated composite function:f(x+3) where f(x)=(2x-6)的平方
1.determine whether or not the given function has the set of all real numbers as its domain :f(t)=根号下(1-x)
2.determine the domain of the given function:f(x)=X的三次方-3x的平方+2x+5
3.find the difference quotient of f; namely,[f(x+h)-f(x)]/h :f(x)=2x+3
4.find the indicated composite function:f(x+3) where f(x)=(2x-6)的平方
问题解答：
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