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Ответ дан
igundane

3x(x+y)-3x^2=3x^2+3xy-3x^2=3xy\7a(a-b)-7a^2=7a^2-7ab-7a^2=-7ab

Ответ

Ответ дан
takushnir

3х(х+у)-3х²=3у=²+3ху-3х²=3ху

7а(а-b)-7а²=7а²-7аb-7а²=-7аb


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