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ynotka03
@ynotka03
July 2022
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ник3709
1)х+1/х=2,5;
(х+1/х)^2=(2,5)^2;
х^2+2*х*1/х+(1/х)^2=6,25;
х^2+2+1/х^2=6,25;
х^2+1/х^2=6,25-2;
х^+1/х^2=4,25.
2)1/а-а=1,2;
(1/а-а)^2=(1,2)^2;
1/а^2-2*1/а*а+а^2=1,44;
1/а^2-2+а^2=1,44;
1/а^2+а^2=1,44+2;
1/а^2+а^2=3,44.
3)а-в=4; ав=1,5;
(а-в)^2=4^2;
а^2-2ав+в^2=16;
а^2+в^2=16+2ав=16+2*1,5=16+3=19;
а^2+в^2=19.
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Answers & Comments
(х+1/х)^2=(2,5)^2;
х^2+2*х*1/х+(1/х)^2=6,25;
х^2+2+1/х^2=6,25;
х^2+1/х^2=6,25-2;
х^+1/х^2=4,25.
2)1/а-а=1,2;
(1/а-а)^2=(1,2)^2;
1/а^2-2*1/а*а+а^2=1,44;
1/а^2-2+а^2=1,44;
1/а^2+а^2=1,44+2;
1/а^2+а^2=3,44.
3)а-в=4; ав=1,5;
(а-в)^2=4^2;
а^2-2ав+в^2=16;
а^2+в^2=16+2ав=16+2*1,5=16+3=19;
а^2+в^2=19.