x y v but actually the relevant variables for your problem are u and v.

只是让f的式子变得漂亮点，，So，x，and，y，are，giving，you，a，nice，formula，for，f，实际上，与问题有关的变量是u、

youdao

x y v but actually the relevant variables for your problem are u and v.

只是让f的式子变得漂亮点，，So，x，and，y，are，giving，you，a，nice，formula，for，f，实际上，与问题有关的变量是u、

youdao