А) 15(3х-5)+6 (7-2х) б)-8 (-6+4у)+2(-18-11у)

А) 15(3х-5)+6 (7-2х)=45х-75+42-12х=33х-33=33(х-1)
Б)-8 (-6+4у)+2(-18-11у)=48-32у-36-22у=12-54у

А) 15 (3х-5)+6 (7-2х)=
= 45х-75+42-12х=
45х-12х=75-42
33х=33 х=33:33 х=1

15 (3×1-5)+6 (7-2×1)=
=15 (-1 )+6(40)=
=-15+240=
=225

Б) -8 (-6+4у)+2 (-18-11у)= 48-32у-36+22у=
= -10у= -12 у= -12 : -10 у=1,2

-8 (-6+4×1,2 )+2(-18-11×1,2)= 9,6-62,4= -52,8
=