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a) y=-1½
-4²-1(y+1)-2y²-3×(-2)=
b) a=-2
-5a³-3(a²+5a)-6(a³+4a) =
c) x=1,5 y=0,5
4x(2x-y)-5(x²-y)+3x=
d) b=¼ c=(-¼)
2b(2b-c)-4c(2b+c)+3c²=
e) x=1½
-2(½x²-3x)-(-2x²+1)-x=
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