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youwin15
@youwin15
November 2021
1
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помогите сократить дробь
3х²-25х-18
----------------
х² -5х- 36
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ХеленаВойцеховская
3
-25x-18=0
D=25*25+18*4*3=841=29
x1,2=(25+-29):6
х1=-4/6=-2/3
х2=9
3
-25x-18=(х-9)*(х+2/3)
х² -5х- 36=0
D=25+36*4=13*13
x1,2=(5+-13)\2
x1=9
x2=-4
(x+4)(x-9)=
х² -5х- 36
в итоге:
(х-9)*(х+2/3)
х+2/3
---------------- = --------- (если х не равно 9)
(x+4)(x-9) х+4
2 votes
Thanks 1
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Answers & Comments
D=25*25+18*4*3=841=29
x1,2=(25+-29):6
х1=-4/6=-2/3
х2=9
3-25x-18=(х-9)*(х+2/3)
х² -5х- 36=0
D=25+36*4=13*13
x1,2=(5+-13)\2
x1=9
x2=-4
(x+4)(x-9)=х² -5х- 36
в итоге:
(х-9)*(х+2/3) х+2/3
---------------- = --------- (если х не равно 9)
(x+4)(x-9) х+4