Khai triển: (a - b)^3 ta được kết quả.

Hope you could get an idea from here.

Doubt clarification - use comment section.

answer: i believe its b. if you sound out the sentences that sounds wrong.

answer

a,b, and d

explanation

a reflection angle is more than

but less than;

an angle that measures

is a reflex angle.(true)

an angle that measures less than

is acute.(true)

provided we are considering angles greater or equal to zero.

an acute angle lies in the range.

an obtuse angle is less than 180° but more than 90°

an angle that measures 300° is obtuse (false)

an angle that measures 65° is an acute angle.(true)