5.50 помогите решить плиз
1)(2а+5-7)(2а+5+7)=(2а-2)(2а+12) 2)(5х-2у-3у)(5х-2у+3у)=(5х-5у)(5х+у) 3)(р-3р+1)(р+3р+1)=(1-2р)(4р+1) 4)(2а+b-a-2b)(2a+b+a-2b)=(a-b)(3a-b) 5)(x+y-x-y)(x+y+x-y)=2y 6)(4p-q-2p+3q)(4p-q+2p+3q)=(2p+2q)(6p+2q)