14.D

15.B

16.C

d b c

II. 

1B

2A

3C

4B

5D

6B

7D

8D

Bài 5:

a) Do \(x,y\in N\)

\(\Rightarrow\left\{\left(x;y-2\right)\right\}\in\left\{\left(1;7\right),\left(7;1\right)\right\}\)

\(\Rightarrow\left(x;y\right)\in\left\{\left(1;9\right),\left(7;3\right)\right\}\)

b) Do \(x,y\in N\)

\(\Rightarrow\left(x+1;y+5\right)\in\left\{\left(1;12\right),\left(2;6\right)\right\}\)

\(\Rightarrow\left(x;y\right)\in\left\{\left(0;7\right),\left(1;1\right)\right\}\)

c) Do \(x,y\in N\)

\(\Rightarrow\left(x-1;2y+1\right)\in\left\{\left(18;1\right),\left(2;9\right),\left(6;3\right)\right\}\)

\(\Rightarrow\left(x;y\right)\in\left\{\left(19;0\right),\left(3;4\right),\left(7;1\right)\right\}\)

\(5,\\ a,=x^4+4x^2+4-4x^2=\left(x^2+2\right)^2-4x^2=\left(x^2-2x+2\right)\left(x^2+2x+2\right)\\ b,=x^4+16x^2+64-16x^2=\left(x^2+8\right)^2-16x^2=\left(x^2-4x+8\right)\left(x^2+4x+8\right)\\ c,=x^8+x^7+x^6-x^6+x^5-x^5+x^4-x^4+x^3-x^3+x^2-x^2+x-x+1\\ =x^6\left(x^2+x+1\right)-x^4\left(x^2+x+1\right)+x^3\left(x^2+x+1\right)-x\left(x^2+x+1\right)+\left(x^2+x+1\right)\\ =\left(x^6-x^4+x^3-x+1\right)\left(x^2+x+1\right)\)

\(d,=x^8+2x^4+1-x^4=\left(x^4+1\right)^2-x^4=\left(x^4-x^2+1\right)\left(x^4+x^2+1\right)\\ =\left(x^4-x^2+1\right)\left(x^4+2x^2+1-x^2\right)\\ =\left(x^4-x^2+1\right)\left(x^2-x+1\right)\left(x^2+x+1\right)\\ e,=x^5+x^4-x^4+x^3-x^3+x^2-x^2+x+1\\ =x^3\left(x^2+x+1\right)-x^2\left(x^2+x+x\right)+\left(x^2+x+1\right)\\ =\left(x^3-x^2+1\right)\left(x^2+x+1\right)\\ f,=x^3+2x^2-x^2-2x+2x+4\\ =\left(x+2\right)\left(x^2-x+2\right)\\ g,=x^4+2x^2+1-25=\left(x^2+1\right)^2-25\\ =\left(x^2+1-5\right)\left(x^2-1-5\right)=\left(x^2-4\right)\left(x^2-6\right)=\left(x-2\right)\left(x+2\right)\left(x^2-6\right)\)

\(h,=x^3-2x^2+2x^2-4x+2x-4=\left(x-2\right)\left(x^2+2x+2\right)\\ i,=a^4-4a^2b^2+4b^4-4a^2b^2=\left(a^2-2b^2\right)^2-4a^2b^2\\ =\left(a^2-2ab-2b^2\right)\left(a^2+2ab-2b^2\right)\)

a: =>x=75:25%=300

b: =>11/12x=-7/12

hay x=-7/11

c: \(\Leftrightarrow\left(x-1\right)\cdot\dfrac{1}{4}=\dfrac{1}{2}-\dfrac{3}{4}=\dfrac{-1}{4}\)

=>x-1=-1

hay x=0

\(a,=0,25.x=75\Rightarrow x=75:0,25=300\)

\(b,\dfrac{11}{12}x=\dfrac{1}{6}-\dfrac{3}{4}=\dfrac{-7}{12}\)

\(x=\dfrac{-7}{12}:\dfrac{11}{12}=\dfrac{-7}{11}\)

\(c,\dfrac{1}{4}\left(x-1\right)=\dfrac{1}{2}-\dfrac{3}{4}=\dfrac{-1}{4}\)

\(x-1=\dfrac{-1}{4}:\dfrac{1}{4}=-1\)

\(\Leftrightarrow x=0\)

a)=>\(\dfrac{1}{4}.x=75\)

=>x=300

b)\(\dfrac{11}{12}x+\dfrac{3}{4}=\dfrac{1}{6}\)

<=>\(\dfrac{11}{12}x=\dfrac{-7}{12}\)

=>x=\(\dfrac{-7}{11}\)

c)\(\dfrac{3}{4}+\dfrac{1}{4}\left(x-1\right)=\dfrac{1}{2}\)

<=>\(\dfrac{3}{4}+\dfrac{x}{4}-\dfrac{1}{4}=\dfrac{1}{2}\)

<=>\(\dfrac{x}{4}=0\)

=>x=0

24 B

25 C

26 B

27 C

28 A

29 D

30 C

31 A

32 C

33 B

34 B

35 D

36 C

37 C

38 B

39 C

 1.A     2.B       3. D      4. C      5.B       6. A      7. D      8. C     9. D     10. B

11 B   12  D   13 C   14 A    15 C    16 A  17 D    18 B   19 B    20 C

21 A

22 A

1A 2B 3D 4D 5B 6A 7D 8C 9D 10B 11B 12C 13C 14A 15D 16A 17D 18B 19B 20C 21A 22A 

Em nên chia bài này ra làm 2, 3 nhé vì liền một lúc 4 đoạn như vậy mng sẽ nản hoặc khó để làm em nhé!