Ответ:
Надеюсь помогла :)
Пошаговое объяснение:
1.
1) 2(х-7у+3z)= 2x-14y+6z
2) -7(5-a-4b)= -35+7a+28b
3) (c-8d+6d)×(-1.2)=(c-2d)×(-1.2)= -1.2c+2.4d
44) -p(-x+2y-4.6)= px-2yp+4.6p
5)-0.6x(-5+3m-1,4n)= 3x-1.8mx+0.84nx
6) -8(3/4a+1/2b-5/16c-0.6)= -6a-4b+5/2c+24/5=
= -6a-4b+2.5c+4.8
2.
1) (x+2.3)-(x+7.8)= x+2.3-(x+7.8)= x+2.3-x-7.8
x-x=2.3-7.8
0x=5.5
2) -(7.2-y) +(-y+1.6)= -7. 2+y-y+1.6= -7.2+1.6= -5.6
3) -(y-7.4+x)-(11.6-y)= -y+7.4-x-11.6+y
y-y=0(убираем)
+7.4-11.6-x= -4.2-x
4) (-2.6+x+y) -(x-y-2.6) = -2.6+x+y-x+y+2.6= 2y
-2.6+2.6=0
x-x=0