vào đây: so sánh A=1030 và B=2100

Viết đề lên mk giải cho

Mai studies better than Hoa

A. Hoa doesn't study as well as Mai.

B.Hoa doesn't study as well like Mai.

C.Hoa studies not as well as Mai.

D.Hoa studies less as well as Mai.

a, Ta có \(3^{x+1}=81\Rightarrow3^{x+1}=3^4\)

\(\Rightarrow x+1=4\Rightarrow x=3\)

Vậy x= 3

b, Ta có \(3^x+3^{x+1}=324\Rightarrow3^x+3^x.3=324\)

\(\Rightarrow3^x.\left(1+3\right)=324\Rightarrow3^x.4=324\)

\(\Rightarrow3^x=81\Rightarrow3^x=3^4\Rightarrow x=4\)

Vậy x=4

Sắp xếp những từ sau để viết thành câu hoàn chỉnh.

1. badminton/school/classmates/after/play/my/often.

--> My classmates often play badminton after school.

2. school/group/theater/play/they/their/are/a/with/rearsing.

-->They are rearsing a play with their school theater group.