Question

Efectuați calculele cu numere reale: a)8x-3x+6x-8x;b)4x²-8x²+18x²-15x²;c)7,2xy+1,8xy-1,4xy;d)2√3a+4√3a-√108a+√48a.

Answer 1

a) 8x-3x+6x-8x=-3x+6x=3x

b) 4x²-8x²+18x²-15x²=-4x²+18x²-15x²=14x²-15x²=-x²

c) 7,2xy+1,8xy-1,4xy=9xy-1,4xy=7,6xy

d) 2√3a+4√3a-√108a+√48a=
  =6√3a-6√3a+4√3a=
  =4√3a

Answer 2

a) 8x-3x+6x-8x=5x-2x=3x
b) 4x^2-8x^2+18x^2-15x^2= -4x^2+3x^2= -x^2=-x^2
c) 7,2xy+1,8xy-1,4xy= 9xy-1,4xy=7,6xy
d) 2√3a+4√3a-√108a+√48a= 6√3a-6√3a+4√3a= 0+4√3a= 4√3a

Sper ca te-am ajutat!