Ответ:
Объяснение:
7x²-5xy+19-(-6x²+xy-y²+19)=
=7x²-5xy+19+6x²-xy+y²-19=
=13x²+y²-6xy = 13x²+y²-6xy
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Verified answer
Ответ:
Объяснение:
7x²-5xy+19-(-6x²+xy-y²+19)=
=7x²-5xy+19+6x²-xy+y²-19=
=13x²+y²-6xy = 13x²+y²-6xy
13x2-6xy-y2
13x2-6xy+y2
x2-4xy-y2+38