SAT数学之方程式例题分析
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SAT数学之方程式例题分析

文章来源:华樱外语   发布时间:2016年11月04日   点击数:

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方程式是SAT数学的必考题型,一起来看几道例题吧
 
补充:Exponents
 
Multiplying exponents when bases are the same 
 
Dividing exponents when bases are the same
 
Multiplying and dividing exponents when exponents are the same
 
Raising powers to powers
 
Special exponents : zero and one
 
Some terms commonly seen in Algebra
 
Variable   &   Constant
Coefficient 
Binomial & polynomial  
quadratic
equations   &  root(solutions/ X-intercepts) 
 
The appications of equations:
 
eg: The size of an art collection is tripled, and then 70 percent of the collection is sold. Then increase the size of the collection by 10 percent. The size of the art collection is then what percent of its size before these three changes?
A.240%            B.111%               C.99%                D.21%
Pratice:1.The price of an item in a store is p dollars. If the tax of the item is t%, what is the total cost in dollars of n such items,including tax?
A.npt           B.npt+1            C.100n(p+pt)              D.np(t+100)/100
2.Vehicle A travels at x miles per hour for x hours.Vehicle B travels a miles per hour faster than Vehicle A, and travels b hours longer than A.Vehicle B travels how much farther than Vehicle A, in miles?
A.x -ab               B. ax+bx+ab            C.x +abx+ab          D.2x +(a+b)x+ab
 
必备单位换算:
 
1 foot= 12 inches =  0.3048m 
1 yard= 3 feet = 0.9144m 
1 mile= 1760 yd = 1.609km 
1 ounce= 28.3495231g 
1 pound= 16ounces= 0.45359237kg 
1 pint = 1/8 gallon= 1/2 quart= 16 ounce= 0.473 liter
 

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