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第186章 原来你背过啊!(2 / 2)

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看题!

看题!

别想那些乱七八糟的事情!

第三道是路程问题!

【A、B两城相距56千米。有甲、乙、丙三人。甲、乙从A城,丙从B城同时出发,相向而行。】

【甲、乙、丙分别以每小时6千米、5千米、4千米的速度行进。】

【求出发后经多少小时,乙在甲丙之间的中点?】

嗯?

这道题简单啊!

随便设个未知数,就能快速算出答案。

项南方心内迷惑,不知郑老师会出这么简单的问题。

而下一秒郑安国就解答了项南方的迷惑,点点题目,对准备埋头答题的白青山道:“你和洛北口头演算吧!”

哦!

项南方恍然明悟!

考察短暂记忆和思维缓存吗?

郑老师想到还真是全面啊!

大脑自动运转,项南方有了竞胜的心思!

莫非真的不如洛北,她要拼一拼!

【设经过x小时后,乙在甲、丙之间的中点,依题意得6x-5x=5x+4x-56,解得x=7。】

嗯?

解出答案,项南方第一时间看向洛北,发现他正皱眉思索,有点儿奇怪,也有第点儿欣喜!

本小章还未完,请点击下一页继续阅读后面精彩内容!她和他的差距,不是很远嘛!

洛北觉察到项南方注视,眨眨眼,小声嘀咕:“我看了这么多奥数题,觉得甲乙两个家伙真是倒霉蛋。天天跑来跑去,就算钓个鱼,还有人来一起吃!”

噗!

项南方又笑了,犹如春花绚烂!

黎元生看到这一幕,心里跟针扎般难受。

做题!

做题!

他聚拢心神,尽量关注题目本身,想要证明自己。

“算出来了!”

黎元生大喊,满脸兴奋。

他斜睨洛北,就像骄傲的孔雀,生怕别人不知道自己在开屏。

“闭嘴!”

项南方回头看去,眼神冷冽:“别干扰他们答题!”

她猜到了黎元生的心思,无外乎耀武扬威,压一压洛北。

身为高中生,而且是助教,这种行为有点儿卑劣!

而事实如她所料,白青山听到黎元生的高喊,不由自主向对方瞥去,思路瞬间断掉,脸上露出沮丧的表情。

他看了看侧边的洛北,对方脸上的沉静感染了白青山。

北哥也没答出来,自己还有机会!

白青山重新演算,思路渐渐清晰,很快算出了答案。

他举手示意郑安国,没有说话,彰显出良好的个人素养。

“洛北?”

郑安国眼中闪过狐疑,瞥下洛北:“你呢?”

“哦!”

洛北淡然回应:“我也快了!”

“出来了!”

他闭目想了两秒,点点头:“答案是7!”

“哼!”

黎元生趁机吐槽:“谁都知道答案是7,看来这道题你没背过啊!”

“原来你背过啊!”

洛北恍然大悟,看向黎元生:“怪不得你那么兴奋!”

“你!”

黎元生郁闷了!

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