Math part 1
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An equation that contains two variables and the degree of each term containing the variable is one, is called a linear equation in two variables.
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the general form of linear equation in two variables.

determinant method Cramer's rule
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using determinants simultaneous equation can be sold easily and in less space, this method is known as a determinant method.

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A standard form of quadratic equation
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Formula method

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Third term
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last term of an A.P.
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the sum of the last term of an A.P.
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Common difference (d)

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Direct method
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Assumed mean method
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step deviation method

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median
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Mode
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central angle
