упростить выражения:10(1-z)^2+20z
10(1-2z+z^2)+20z
10-20z+10z^2+20z
10z^2+10
10(z^2+1)
10-10z^2+20z=10-20z+20z=10
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10(1-2z+z^2)+20z
10-20z+10z^2+20z
10z^2+10
10(z^2+1)
10-10z^2+20z=10-20z+20z=10