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哽咽(第1页)

章节目录保存书签

如她所言,没记起来。

月考临近的周末宋聿又一次住进她家,已经熟门熟路了,收拾好客厅,摆上自带的枕头、毯子、薄被……

“月考一定考好,后面还会住进来。”

他如是解释。

孟知卿没说话,因为月考考六门,物理化学生物也计入总分,物理化学,嗯。

她没说话。

“能考好的放心,”

宋聿去她房间抱来六本资料,累到茶几上,“听说这次试卷难,你只要把握住基础分,其他,你不会他们也不会,”

扶孟知卿坐下,“所以差距不会太大,你英语还能拉点分,进年级前一百没问题。”

孟知卿,沉默。坐到沙发上,盯着那六本资料一动不动。

“生物还行是吗,那先从物理开始。”

他翻开物理资料,前两页罗列了各章节所有公式,每条公式底下对应详细解释,以及各字母所代表的含义。

“还是理解为主,”直接翻到第一章,“譬如加速度,什么是加速度,一个描述物体速度变化的量,那么时间和速度就是关键变量,”

指着第一道例题说,“小球撞击木块,给了木块一个加速度,要求加速度,那么就从中找到未知量,”

将资料递到孟知卿跟前,“你觉得哪个是未知量。”

孟知卿支吾了一下。

他接着道:“求加速度,加速度公式是末速度减初速度,除以所用时间,那你看这题题干呢,三个变量,哪个变量已知?”

“时间吧。”

孟知卿不是非常确定地说。

“对了,”他用笔尖指向题干,“要求第二秒小球的加速度,那么时间就已知,是二,”

“还有呢,除了时间还能知道什么?”

“初速度。”孟知卿没思考脱口而出,因为在他说话的时候已经想明白他想表达的意思了,“所以唯一未知量是末速度,求末速度就好了,”

说着翻到前面公式页,找到匀变速直线运动那章,“位移公式里涉及到了末速度,但位移,时间和初速度都已经知道了,只剩两个未知量,两个未知量两个方程,算出加速度。”

宋聿点头,“对。”

眼睛里有赞赏,有你很聪明,就是这样。

孟知卿干脆合上资料,“那不用看了,按这个解题思路,把公式记熟记透就好了,考前,明天再记,今天先看化学。”

“化学知识点很繁琐,需要日积月累,”他不认可地望向她,“你连周期表都不会背,很难临时抱佛脚提高多少。”

孟知卿:“……”

周期表她会背,不熟而已。

“而且直线运动是整个高中物理最简单的部分,”

他还是捡过物理资料,“后面还有抛物运动,圆周运动,又涉及力,能,磁场,你背了公式不理解还是解不出来,”

章节目录

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