分段函数

题1: 31. 已知函数$f(x)=\left\{\begin{array}{l}{lo{g}_{2}x,x>0}\\ {{2}^{x},x\leqslant 0}\e

题2: 28. 已知函数$y=\left\{\begin{array}{l}{x^2}+1(x\leqslant 0)\\ 2x(x>0)\end{array}\ri

题3: 30. 设函数$f(x)=\left\{\begin{array}{l}{-x,\;\;x\leqslant 0}\\ {{x}^{2},\;x>0}\end{

题4: 26. 若$f(x)=\left\{\begin{array}{l}\sin \frac{\pi x}{6}(x\leqslant 0)\\ 1-2x(x>0

题5: 33. 已知函数$f(x)=\left\{\begin{array}{l}\frac{1}{2}x+1,x\leqslant 0,\\ -{x^2}+2x+1,

题6: 24. 设函数$f(x)=\left\{\begin{array}{l}{(\frac{1}{3})}^{x}-8,x\leqslant 0\\ lgx,x>

题7: 27. 已知函数$f(x)=\left\{\begin{array}{l}{{x}^{2}+4x+3,x\leqslant 0}\\ {3-x,x>0}\end

题8: 35. 已知函数$f(x)=\left\{\begin{array}{l}{{\log }_{\frac{1}{3}}x,x>0}\\ {{2}^{x},x\l

题9: 34. 设函数$f(x)=\left\{{\left.\begin{array}{l}{1,x\leqslant 0,}\\ {{2^x},x>0,}\end{

题10: 25. $f(x)=\left\{\begin{array}{l}2{e^{x-1}},x<2\\ {\log _3}({x^2}-1),x\geqslant

题11: 32. 已知函数$f(x)=\left\{\begin{array}{l}{{2}^{x},x\geqslant 0}\\ {-(\frac{1}{2})^{x

题12: 29. 设函数$f(x)=\left\{\begin{array}{l}\frac{1}{2}x-1({x\geqslant 0})\\ \frac{1}{x