(z+x+3)²=
=(z+x)²+2(z+x)3+3²=
=[z²+2zx+x²]+[6z+6x]+9
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(z+x+3)²=
=(z+x)²+2(z+x)3+3²=
=[z²+2zx+x²]+[6z+6x]+9
Успехов