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lenavolkova
@lenavolkova
December 2021
2
18
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упростите выражение 1)(5x-y)(5x-y)+y^2 : 2) (p+q)^2+(p-q)^2-2q^2
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msLapochka
2(5x-y)+y^2 ну это то так
0 votes
Thanks 1
msLapochka
((p+q)+(p-q))^2-2q^2 а это наверное так
Droko
1) (5x-y)(5x-y)+y²=25х²-10ху+у²+у²=25х²-10ху+2у²
2) (p+q)
²
+(p-q)
²
-2q
²=p²+
2pq
+
q²
+p²
-2pq
+
q²-
2q²
=2p²
2 votes
Thanks 1
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Answers & Comments
2) (p+q)²+(p-q)²-2q²=p²+2pq+q²+p²-2pq+q²-2q²=2p²