日韩美女一区二区三区-久久久精品在线视频-五月天久久久噜噜噜久久-国产免费视屏-影音先锋亚洲资源-大番蕉尹人一线久久-国产高清视频在线观看97-成人春色影视-综合亚洲桃色第一影院-免费看污视频在线观看-久久这里只精品热在线18-黄色一级视频看看-www.桃色-不卡av网-国产亚洲日韩妖曝欧美-成人国产精品一区

　　今天我們便來(lái)細(xì)看一下文字題到底該如何解答，大體的原則是從后往前讀，而不是從前往后讀

　　文字題讀什么?

　　1.question

　　2.圖表 橫縱坐標(biāo)表示變量以及單位度量

　　3.題目中的數(shù)字，比較關(guān)系，倍數(shù)關(guān)系

　　4.單位換算以及四舍五入

　　來(lái)兩個(gè)例子~~~

　　Typically, when people contract an infectious disease, their immune system immediately begins to produce extra white blood cells to fight the disease. The scatterplot shows the white blood cells reproducing in an infected patient, along with several values found when modeling the data using a graphing calculator. According to this model, how many white blood cells per microliter of blood did the patient have before he contracted the disease?

　　(A) 3,400

　　(B) 8,500

　　(C) 10,000

　　(D) 13,600

　　分析：?jiǎn)栴}是：contract the disease 前對(duì)應(yīng)的white blood cells per microliter of blood數(shù)量，所以應(yīng)該求t = 0 時(shí)Blood cell數(shù)量。圖表反應(yīng)的是：感染病人體內(nèi)white blood cells同hour的變化關(guān)系，呈現(xiàn)上升趨勢(shì)，并且縱坐標(biāo)單位為thousands per mcl。結(jié)合上升趨勢(shì)以及table中給出數(shù)據(jù)判斷出為exponential growth model，每過(guò)一個(gè)小時(shí)白細(xì)胞數(shù)量變成原來(lái)兩倍。此題特殊之處在于原點(diǎn)并非t = 0 時(shí)對(duì)應(yīng)的初始值，所以還要往前推。t = 4, y = 136，所以t = 3, y = 68依次推得：t = 0 , y = 8.5 結(jié)合縱軸單位度量，答案為8500。

　　所以此題結(jié)合問(wèn)題以及圖示就可以得出答案，不需要重讀前面的背景部分。

　　An occupational health organization published a study showing an increase in the number of injuries that resulted from elderly people falling in the bathtub. In response to this increase, a medical supply company decided to drop its price on bathtub lifts from $450 to $375, hoping to still break even on the lifts. The company breaks even when its total revenue (income from selling n bathtub lifts) is equal to its total cost of producing the lifts. If the cost C, in dollars, of producing the lifts is C = 225 n + 3,150, how many more of the lifts does the company need to sell at the new price to break even than at the old price?

　　(A) 7 (B) 12 (C) 14 (D) 21

　　分析：觀察問(wèn)題： how many more of the lifts does the company need to sell at the new price to break even than at the old price?所以是一題減法題。涉及到一個(gè)經(jīng)濟(jì)學(xué)詞匯“break even”，向前掃讀有解釋?zhuān)簍otal revenue (income from selling n bathtub lifts) is equal to its total cost of producing the lifts 所以意思是收入 = 成本，所以問(wèn)題問(wèn)的是新價(jià)格下盈虧相抵要比舊價(jià)格下盈虧相抵多賣(mài)多少電梯。 成本公式為 C = 225 n + 3,150

　　掃讀背景中的數(shù)字為價(jià)格從450下降為375，可設(shè)原價(jià)為a, 新價(jià)為b，列式：

　　450a = 225 a + 3,150 375b = 225 b + 3,150 解得： a = 14, b= 21

　　最終答案為a – b = 7 選 A

　　所以同學(xué)們有了解到文字題的讀題順序以及注意事項(xiàng)嗎?最主要的是克服恐懼心理，多練習(xí)讀題方法，而不是一遍遍讀題。

　　精彩推薦：

　　SAT備考注意三大心態(tài)調(diào)整

　　解讀SAT數(shù)學(xué)考試內(nèi)容及評(píng)分標(biāo)準(zhǔn)

　　SAT考試易犯錯(cuò)語(yǔ)法點(diǎn) 你知道嗎？

　　SAT數(shù)學(xué)三大解題技巧分享

　　SAT考試次數(shù)減少為每學(xué)年四次