a,Ta thấy \(x^4\ge0\Rightarrow N\left(x\right)=x^4+4\ge4\)\(\Rightarrow N\left(x\right)\)vô nghiệm

Vậy đa thức N(x) vô nghiệm với mọi x

b,Ta thấy x^{10\(\ge0\Rightarrow M\left(x\right)=x^{10}+7\ge7\Rightarrow M\left(x\right)\)}vô nghiệm

Vậy đa thức M(x) vô nghiệm

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer in each of the following questions.

____________of all the staff, I would like to wish you a happy retirement.

A. Instead

B. In place

C. On behalf

D. On account

=\(\dfrac{1}{5}\).(\(\dfrac{5}{4.9}+\dfrac{5}{9.14}+\dfrac{5}{14.19}+....+\dfrac{5}{44.49}\)).\(\dfrac{1-\left(3+5+7+...+49\right)}{89}\)

=\(\dfrac{1}{5}.\left(\dfrac{1}{4}-\dfrac{1}{9}+\dfrac{1}{9}-\dfrac{1}{14}+...+\dfrac{1}{44}-\dfrac{1}{49}\right)\).\(\dfrac{1-624}{89}\)

=\(\dfrac{1}{5}.\left(\dfrac{1}{4}-\dfrac{1}{49}\right)\).(-7)

=\(\dfrac{1}{5}\).\(\dfrac{45}{196}\).(-7)=\(\dfrac{-9}{28}\)

56 trận

C

C