Ответ:
Пошаговое объяснение:
1) а2+ab+3a+ba+b2+3b-3a-3b-9=
=a2+2ab+b2-9
2) a2 +ab+5a+ab+b2+5b-5a-5b-25=
=a2+2ab+b2-25
3) x2-xy+x-xy+y2-y-x+y-1=
=x2-2xy+y2-1
4) x2+xy-8x-xy-y2+8y+8x+8y-64=
=x2-y2-64+16y
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Ответ:
Пошаговое объяснение:
1) а2+ab+3a+ba+b2+3b-3a-3b-9=
=a2+2ab+b2-9
2) a2 +ab+5a+ab+b2+5b-5a-5b-25=
=a2+2ab+b2-25
3) x2-xy+x-xy+y2-y-x+y-1=
=x2-2xy+y2-1
4) x2+xy-8x-xy-y2+8y+8x+8y-64=
=x2-y2-64+16y