Toán Lớp 8: Rút gọn các biểu thức sau:
(x + 3 ) . ( x- 2) + (x-3) $^{2}$
(x + 2 )$^{2}$ + ( x + 1 ) ( x -1 )
( 2x – 1 ) ( 2x + 1) – ( 2x – 3 )$^{2}$
(x + 2 )$^{3}$ – ( x +1 ) $^{3}$ – ( x + 1 )$^{2}$
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Toán Lớp 8: Rút gọn các biểu thức sau:
(x + 3 ) . ( x- 2) + (x-3) $^{2}$
(x + 2 )$^{2}$ + ( x + 1 ) ( x -1 )
( 2x – 1 ) ( 2x + 1) – ( 2x – 3 )$^{2}$
(x + 2 )$^{3}$ – ( x +1 ) $^{3}$ – ( x + 1 )$^{2}$
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