SAT數(shù)學(xué)練習(xí)題實(shí)例講解(1).

不少語法不是很牢固的童鞋看到more than、less than的SAT數(shù)學(xué)題就懵了，看不懂題意。躍躍說讀題斷句很重要，呵呵，為了幫助大家強(qiáng)化一下這種題型，躍躍收集了10多道這樣的SAT數(shù)學(xué)題，下面來看一下吧，有解釋的不對的地方大家給我留言 tx + 12y = -3,t is a constant,if the slope of the line is -10,what the value of t? 題目解讀：tx + 12y = -3，t是常數(shù)，如果這個(gè)線性函數(shù)的斜率是-10，t是幾？ 解析：原式可化為(-t/12)x – 1/4 = y，斜率為-t/12，因?yàn)樾甭蕿?10，所以可得-t/12=-10，解得t=120 生詞回顧：constant常數(shù)，slope斜率 ————————————————————————————– If 10 + x is 5 more than 10, what is the value of 2x ? 題目解讀：如果10 + x是15，那么2x的值是多少 解析：2x = 10 ————————————————————————————– In the 30-day month of April,for every 3 days it rained,there were 2 days it did not rain.the number of days in April on which it rained was how much greater than the number of days on which it did not rain? A:6 在4月的30天里，每三天要下雨，然后2天不下雨，問下雨的天數(shù)比不下雨的天數(shù)多幾天…很明顯30除以(3+2)=6….小學(xué)學(xué)過的等式不解釋 ————————————————————————————– A number is added to 9 less than twice the number. if the result is 180,what is the number? 一個(gè)數(shù)加上比它本身的2倍小9的數(shù),結(jié)果是180，問此數(shù)是多少…..即x+(2x-9)=180，x=63 ————————————————————————————– 看一道乘法原理的試題 The three distinct points P, Q, and R lie on a line l; the four distinct points S, T, U, V lie on a different line that is parallel to line l. What is the toal number of different lines that can be drawn so that each line contains exactly two of the seven points? 簡單看一下題意：三個(gè)不同的點(diǎn)P,Q,R位于直線l上，另外四個(gè)不同的點(diǎn)S,T,U,V位于另外一條直線上，兩條直線平行，求只包含這七個(gè)點(diǎn)中兩個(gè)點(diǎn)的直線條數(shù)。注意看contains exactly two，因此排除這兩個(gè)點(diǎn)在直線l或與其平行的直線的可能。運(yùn)用乘法原理，3*4=12 生詞釋義：distinct不同的，parallel平行的 ————————————————————————————– At a certain hospital,89 children were born in the month of June.If more children were born on the fifteenth of June than on any other day in June.What is the least number of children that could have been born on the fifteenth of June. 題不是很難，但要注意問的是什么，看一下題意，某醫(yī)院6月份出生89個(gè)嬰兒，如果15號出生的嬰兒數(shù)量比其他29天都多，那么15號那天至少出生幾個(gè)嬰兒就可以了。 平均一天生不到3個(gè)，但必須都是整數(shù)，所以平均一下就是3個(gè)，所以15號那天生4個(gè)就夠了 ————————————————————————————– If 3 more than twice a number is equal 10, what is the 4 times the number? 這個(gè)題翻譯很重要啊，躍躍咋一看題目就懵了，呵呵。解釋一下吧，寫給看不懂題意的童鞋，先要找到if分句的謂語is，然后分別翻譯謂語前后的內(nèi)容就可以了，3 more than twice a number比一個(gè)數(shù)字的兩倍還要大三的數(shù)，is equal 10等于10，用公式表示2x+3=10，4x=14。