Объяснение:
1.
(5а-2)(2+5а)=(5а-2)(5а+2)=(5а)²-2²=
=25а²-4
2.
7(3m-2n)-4(2m-3n)=21m-14n-8m+12n=
=13m-2n
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Answers & Comments
Объяснение:
1.
(5а-2)(2+5а)=(5а-2)(5а+2)=(5а)²-2²=
=25а²-4
2.
7(3m-2n)-4(2m-3n)=21m-14n-8m+12n=
=13m-2n