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diana9325
@diana9325
July 2022
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сократите дробь:
у^2+у-42
---------
у^2-36
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marick0073
Y^2+y-42
-------------
y^2-36
1) y^2+y-42
D=1^2-4*1*(-42)=1+168=13^2;
-1+13 12 -1-13 -14
y1 = ---------- = ---- = 6; y2 = ---------- = ------ = -7
2 2 2 2
y^2+y-42 = (y-6)(y+7);
2) y^2-36 = (y-6)(y+6);
3) (y-6)(y+7) y+7
------------- = -------
(y-6)(y+6) y+6
4 votes
Thanks 6
diana9325
можно после дискрименанта более подробней фото скинуть пожалуйста, а то с цифрами запуталась! буду признательна, спасибо!
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Answers & Comments
-------------
y^2-36
1) y^2+y-42
D=1^2-4*1*(-42)=1+168=13^2;
-1+13 12 -1-13 -14
y1 = ---------- = ---- = 6; y2 = ---------- = ------ = -7
2 2 2 2
y^2+y-42 = (y-6)(y+7);
2) y^2-36 = (y-6)(y+6);
3) (y-6)(y+7) y+7
------------- = -------
(y-6)(y+6) y+6