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45−x=27
x= ____
函数:y=1x+1中,自变量x的取值范围是____
Swimming is my favorite sport.There is________like swimming as a means of keeping fit.
已知定义在﹣3,3上的函数y=f(x)是增函数.
(1)若f(m+1)>f(2m﹣1),求m的取值范围;
(2)若函数f(x)是奇函数,且f(2)=1,解不等式f(x+1)+1>0.