Упростите: 1) 5/6 * (4,2x - 11/5y) - 5,4 * (2/9x - 1,5y) 2) 1,5 * (8x - 6y) - 2,4 * (5y -...

Question

Упростите:
1) 5/6 * (4,2x - 11/5y) - 5,4 * (2/9x - 1,5y)
2) 1,5 * (8x - 6y) - 2,4 * (5y - 3x)

Answer 1

5/6 * (4,2x - 11/5y) - 5,4 * (2/9x - 1,5y)=
=5/6*42/10х-5/6*11/5y-54/10*2/9x+54/10*15/10y=
=3 1/2x-1 5/6y-1 1/5x+8 1/10y=
=2 3/10x +6 4/15y


1,5 * (8x - 6y) - 2,4 * (5y - 3x)=
=12x-9y-12y+7.2x=
=19.2x-19y