请问一个整式除以x-1余数为5,除以x-2余数为7,求它除以x^2-3x+2的余数为多少?
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一个整式 : Q(x)
一个整式除以x-1余数为5
Q(x) = (x-1)g(x) + 5
Q(1) = 5
除以x-2余数为7
Q(x) = (x-2)f(x) + 7
Q(2)= 7
x^2-3x+2
=(x-1)(x-2)
求它除以x^2-3x+2的余数为
Q(x) = (x-1)(x-2)k(x) + ax+b
Q(1) = a+b = 5 (1)
Q(2)= 2a+b = 7 (2)
(2)-(1)
a=2
from (1)
2+b=5
b=3
求它除以x^2-3x+2的余数为多少?
=ax+b
=2x+3
一个整式除以x-1余数为5
Q(x) = (x-1)g(x) + 5
Q(1) = 5
除以x-2余数为7
Q(x) = (x-2)f(x) + 7
Q(2)= 7
x^2-3x+2
=(x-1)(x-2)
求它除以x^2-3x+2的余数为
Q(x) = (x-1)(x-2)k(x) + ax+b
Q(1) = a+b = 5 (1)
Q(2)= 2a+b = 7 (2)
(2)-(1)
a=2
from (1)
2+b=5
b=3
求它除以x^2-3x+2的余数为多少?
=ax+b
=2x+3
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