1. The song made her feel homesick. 

2. Our work makes us have no time to spare.

3. Everybody is fond of spring because the weather is ideal.

Làm ẩu nên đọc lộn đoạn cuối ý C là always being late =(((((((((

`(2x-1)(2x+1)(4x^2+1)`

`=[(2x)^2-1^2](4x^2+1)`

`=(4x^2-1)(4x^2+1)`

`=(4x^2)^2-1^2`

`=16x^4-1`  

`(4x^3y-3y^2)^2`

`=(4x^3y)^2-2.4x^3y .3y^2 +(3y^2)^2`

`=16x^6y^2-24x^3y^3+9y^4` 

1. A
2. A
3. C
4. B
5. A

`(x+1)^3+4(x+1)^3=5.3^6`

`5.(x+1)^3=5.3^6`

`(x+1)^3=(3^2)^3`

`x+1=3^2=9`

`x=9-1`

`x=8` 

`(5x^2+1)^2=(5x^2)^2+2.5x^2 .1+1^2`

`=25x^4+10x^2+1` 

`x^2+6x=34`

`<=>x^2+6x+9=43`

`<=>(x+3)^2=(\sqrt(43))^2`

`<=> [(x+3=\sqrt(43)),(x+3=-\sqrt(43)):}`

`<=> [(x=-3+\sqrt(43)),(x=-3-\sqrt(43)):}`

Vậy `S={-3 +- \sqrt(43)}`.

`A(x)=(-2/3 x^5 y^2)(-9xy^3)`

`=[(-2/3).(-9)].(x^5 .x) .(y^2 .y^3)`

`=6x^6 y^5`

`B(x)=(-1/2 x^2y^3)^2 (-x^2y^3)^3`

`=(1/4 x^4 y^6) (-x^6 y^9)`

`=[1/4 .(-1)] .(x^4 .x^6). (y^6 .y^9)`

`=-1/4 x^(10) y^(15)`