题5: 21.计算:${\log _3}\frac{\sqrt[4]{27}}{3}+lg5+{7^{{{\log }_7}2}}+{\log _2}3\cdot {\
基础fill_compute
题14: 12.已知$2^{a}=3$,$3^{b}=4$,$c=\frac{lna-lnb}{a-b}$,则在$\log _{a}b$,$\log _{a}c$,$\l
基础fill_compute
题17: 19.${\log _3}\sqrt{27}+\sqrt{{(1-\sqrt{2})}^2}-{2^{{{\log }_4}2}}$的值等于 ___$\frac
基础fill_compute
题31: 22.函数$f(x)=\left\{{\left.\begin{array}{l}{{{({\frac{1}{2}})}^x}({x\geqslant 1})}
基础fill_compute
题46: 20.计算:$lg2+lg5-\log _{2}4-{({\frac{16}{9}})^{-\frac{1}{2}}}=$___$-\frac{7}{4}$__
基础fill_compute
题71: 24. 已知函数$f(x)={\log _3}({{x^2}-1})$,$g(x)=x^{2}-2x+a$,$\exist x_{1}\in [2$,$+\in
中等fill_compute