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vadimbboy92
@vadimbboy92
September 2021
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6 номер и 4 номер помогите решить :)
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Nina1952
4а) х^2-10х+21=х^2-3х-7х+21=
=(х^2-3х)-(7х-21)=х(х-3)-7(х-3)=
=(х-3)(х-7)
4б) 5у^2+9у-2=5у^2+10у-у-2=
=(5у^2+10у)-(у+2)=5у(у+2)-(у+2)=
=(у+2)(5у-1)
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Answers & Comments
=(х^2-3х)-(7х-21)=х(х-3)-7(х-3)=
=(х-3)(х-7)
4б) 5у^2+9у-2=5у^2+10у-у-2=
=(5у^2+10у)-(у+2)=5у(у+2)-(у+2)=
=(у+2)(5у-1)