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A²+ab+2a+3ab+3b²+6b-(a²+3ab+2a+ab+3b²+2b)= a²+ab+2a+3ab+3b²+6b-a²-3ab-2a-ab-3b²-2b = 4b
А^2+3ba+ab+3b^2+2a+6b-(a^2+ab+6ab+3b^2+2a+2b)=a^2+3ba+ab+3b^2+2a+6b-a^2-ab-6ab-3b^2-2a-2b=-3ab-4a-3b