THỰC HIỆN PHÉP TÍNH
Câu 1: Thực hiện phép tính:
a) 3xy.(2x
2
– 3yz + x
3
) = 3xy. 2x
2
+3xy. (-3yz) + 3xy. x
3
=
6
x y
3
9
xy z
2
3
x y
4
b)
(24
x
5
12
x
4
6 ) : 6
x
2
x
2
=
24 : 6
x
5
x
2
( 12 ) : 6
x
4
x
2
6 : 6
x
2
x
2
=
4
x
3
2
x
2
1
c) (2x + 3)
2
+ (2x – 3)
2
– (2x + 3)(4x – 6) + xy
= (2x + 3)
2
– 2(2x + 3)(2x – 3) + (2x – 3)
2
+ xy = (2x + 3 – 2x + 3)
2
+ xy
d) (4x
2
+ 4x + 1) : (2x + 1) = 2x + 1