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b) -⅓(a+3b)-2a= dla a=¼ b=-⅓
-⅓a - b =
= -⅓(¼) - (-⅓) =
= -1/12 + ⅓ =
= 5/12
c) 6(3+z)-4(2z+4)+2(8+z)= dla z=1/9 (jedna dziewiąta)
18 + 6z -8z -16 +16 +2z=
= 0z + 18
= 18
d) -4(2x-7-3y)-12(-y-x)= dla x=-1 y=0
= -8x + 28 + 12y + 12y +12x =
= 24y + 4x + 28 =
= 0 + 4(-1) +28 =
= -4 +28 =
= 24
b)= -1/3a-b-2a=-7/3*1/4+1/3=-7/12+5/12=-1/6
c)= 18+6z-8z-16+16+2z=18
d)= -8x+28+12y+12y+12x=4x+24y+28=-4+28=24
"kolokat" w podpunkcie b) zgubił -2a!!