https://school.yangcongxueyuan.com/#/teaching/chapter/fd6243e8-57f6-11e7-833e-2f9c64c1fb49/subsection/e9e54a28-9930-11e8-8045-b75e48eeefa9/theme/200ee0b8-57f7-11e7-ba56-53b6cb00c883/topic/4ccfde5e-57f
中考分式复习（二）