6.isn't

7.returns

8.doesn't rain

9.don't invite

10.What will you do if you are him

11.will buy

12.don't drive/ will have

13.make/ will get

14.will be

15.went/ will meet

We might go on holiday to the moon

22h tối nay là mk phải nộp rồi mong mọi người giúp cho

She is the prettiest girl I've ever met

D

a. Đúng

a)(x+1)²

b)(3x+y)²

c)(5a-2b)²

d)(x-½)²

Ta có:

A(x)+B(x)=2x-3x³+2x²+1+4x³+2x²-5

                 =(-3x³+4x³)+(2x²+2x²)+2x+(1-5)

                 =x³+4x²+2x-4

Thay x=1 vào B(x) ta có:

B(1)=4*1³+2*1²-5

       =4+2-5=1

b)5²x+1-3*4²=-47

=>25x+1-48=-47

=>25x+1=-47+48=1

=>25x=1-1=0

=>x=0/25=0