Ответ:
1)4a(a+b)-a(3a-4b)-8ab=4a²+4ab-(3a²-4ab)-8ab=4a²+4ab-3a²+4ab-8ab=a²
2)a(a+2b)+b(a+b)=a²+2ab+ab+b²=b(2a+b)+a(a+b)
3)a(b+c-bc)-b(a+c-ac)=ab+ac-abc-ab-bc+abc=ac-bc=(a-b)c
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Ответ:
1)4a(a+b)-a(3a-4b)-8ab=4a²+4ab-(3a²-4ab)-8ab=4a²+4ab-3a²+4ab-8ab=a²
2)a(a+2b)+b(a+b)=a²+2ab+ab+b²=b(2a+b)+a(a+b)
3)a(b+c-bc)-b(a+c-ac)=ab+ac-abc-ab-bc+abc=ac-bc=(a-b)c