2017年GRE考試數(shù)學(xué)考點講解8

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  •     Coefficient
        A constant multiplier of a variable is known as coefficient. They are typically represented by letters a,b,c.
        Example:
        In the expression 3x+5,3 is the coefficient of x.
        In the equation 4x+2y=6,4 is the coefficient of x and 2 is the coefficient of y.
        In the inequality 2*sin(x)+3>z,2 is the coefficient of the function sin(x).
        Remember:
        Coefficient cannot change its value.
        GRE數(shù)學(xué)考點介紹:Multiplying Monomials
        Multiplying Monomials
        To multiply two monomials, multiply the coefficients and add the power of the variables.
        By multiplying 3x and 4x, we get (4*3)x∧(1+1)=12x2.
        By multiply 3x and 4y, we get (4*3)xy=12xy.
        Remember:
        Do not forget to add the powers of the same variable.
        The terms need not be like terms to be multiplied.