какое из указанный ниже равенств является верным?
1)(3х+4)^2=9х^2+12х+ 16
2)(2а-1)^2=4а^2-4а-1
3)4р^2-9=(2р-3)(2р+3)
4)4-12м^2=(2-6м)(2+6м)
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