Thực hiện phép tính: a) ( 3 – xy2 )2 – ( 2 + xy2 )2
b) 9x2 – ( 3x – 4 )2
c) ( a – b2 )( a + b2 )
d) ( a2 + 2a + 3 )( a2 + 2a – 3 )
e) ( x – y + 6 )( x + y – 6 )
f) ( y + 2z – 3 )( y – 2z – 3 )

e) none of the above because the measure of angle cba is 101°

no

step-by-step explanation:

2-7=-5

7-2=5

when you combing like terms for ech expression, 5 and -5. these numbers are not equal to each other.

typically if you want , you would actually put questions here for us to you. but hey, that's just me. maybe someone will magically answer the questions for you without knowing what they are.

the sum of the lengths of any two sides of a triangle is greater than the length of the third side. if you take the three sides of a triangle and add them in pairs, the sum is greater than (not equal to) the third side. if that is not true, then it is not possible to construct a triangle with the given side lengths.

step-by-step explanation: