﻿ SAT数学之方程式例题分析 - 华樱外语    SAT数学

# SAT数学之方程式例题分析

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
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

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  ﻿ ﻿

### 机经预测 ﻿

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