Question

simplifique cada uma das expressoes algebricas: a)7x-(-2x+x)+(-3x+5x) b)5y²-(-4y²+7y²)+(y²+9y²-11y²) c)10 ab -[3 ab-(ab+2 ab-5 ab)-8 ab)-8ab] d)2xy+[-5xy+2xy-(2xy+4xy-2xy)-8xy]

Answer 1

a)7x-(-2x+x)+(-3x+5x) =
   7x +2x -x -3x -5x =
   9x -9x = 0


b)5y²-(-4y²+7y²)+(y²+9y²-11y²) =
   5y² +4y² -7y² +y² +9y² -11y² =
   5y² +4y² + y² +9y² -7y² -11y² =
   19y² -18y² = y²


c)10 ab -[3 ab-(ab+2ab-5ab)-8 ab)-8ab]  =
   10ab - [3ab - (-2ab) -8ab ] =
   10ab - [3ab +2ab -8ab ] =
   10ab - [-3ab] =
   10ab +3ab =
   13ab


d)2xy+[-5xy+2xy-(2xy+4xy-2xy)-8xy] =
   2xy+[-5xy+2xy-(4xy) -8xy] =
   2xy+[-5xy+2xy-4xy-8xy] =
   2xy-5xy+2xy-4xy-8xy =
   4xy -17xy =
   -13xy