Toán Lớp 10: Cho hpt
14×2-21y2-6x+45y-14=0
35×2+28y2+41x-122y+56=0
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Toán Lớp 10: Cho hpt
14×2-21y2-6x+45y-14=0
35×2+28y2+41x-122y+56=0
Comments ( 1 )
Giải đáp:
$14x^2-21y^2-6x+45x-14=0$
$35x^22+28y^22+41x-122y+56=0$
$14x^2-21y^2-6x+45x-14=0$
$49.(14x^2-21y^2-6x+45x-14)—15.(35x^22+28y^22+41x-122y+56)=0$
$14x^2-21y^2-6x+45x-14=0$
$161x^2-1449y^2-909x+4035y-1526=0$
$14x^2-21y^2-6x+45x-14=0$
$(161x-483y+218)(x+3y-7)=0$
$=> 161x-483y+218=0$
hoặc $x+3y-7=0$
=>(x;y)=(-2;3);(1;2)
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