>  Distributive Law  Like real number, when multiplying a sum or difference of terms, the distributive property of multiplication allows us to distribute the multip..." />

2017年GRE考试数开云kaiyun(中国)考点讲解10

时间:2017-03-01 17:44:00   来源:开云网页版     [字体: ]
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  •   Distributive Law

      Like real number, when multiplying a sum or difference of terms, the distributive property of multiplication allows us to distribute the multiplying term among the terms being added or subtracted.

      Example:

      3*(2x+y)=3*2x+3*y,

      3a*(2x+y)=3a*2x+3a*y,

      3x*(2x+y)=3x*2x+3x*y.

      (3x+4)*(2x+y)=(3x+4)*2x+(3x+4)*y=3x*2x+4*2x+3x*y+4*y.

      Remember:

      Do not forget to multiply all the terms inside the parenthesis.

      For division, the sum and difference in the numerator can be distributed:(x+y)/(2x+y)=x/(2x+y)+y/(2x+y).

      For division, the sum and difference in the denominator cannot be distributed :(x+y)/(2x+y)≠(x+y)/2x+(x+y)/y.