Докажите тождества
2) (1.5х-2у)^2+(2х+1.5у)^2=6.25(х^2+у^2)
4) (3а-2b)^3+(3a+2b)^3=18a(3a^2+4b^2)
2) (1.5х-2у)^2+(2х+1.5у)^2=6.25(х^2+у^2)
4) (3а-2b)^3+(3a+2b)^3=18a(3a^2+4b^2)
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