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  • 最新GRE考試數學考點講解

    時間:2022-07-30 17:10:07 GRE考試 我要投稿
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    最新GRE考試數學考點講解

      Solve Equation of One Variable

    最新GRE考試數學考點講解

      To solve a linear equation isolate the variable, that is bring the variable to one side with arithmetic operations.

      Example:

      To solve ax+b=c use the following steps:

      1.ax+b=c, subtract b from both sides.

      2.ax=c-b, divide both sides by a

      3.x=(c-b)/a

      Remember:

      All linear equations of one variable can be written as ax+b=c and the solution is x=(c-b)/a.

      GRE考試數學考點:Substitution

      Substitution

      Substitution is a method where one or more variables in an expression is replaced by numbers or another set of variables.To evaluate an expression specific numbers are used as substitute. To express in terms of another set of variables, variables are replaced by the new set of variables.

      Example:

      If x=3, then 2x2+4x+1 can be evaluated by substituting 3 for x.

      Replacing all x by 3, we get 2*32+4*3+1=31.

      If x=2+y, then x2-3 can be expressed in terms of y by replacing all x by (2+y):(2+y)2-3=y2+4y+1.

      Remember:

      Do not forget to replace all occurrences of the variable.

      After substitution the variable does not appear anywhere in the expression.

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