Môn Toán Lớp 8: 1) Rút gọn
a) ( a + b ) ³ ( a – b ) ³
b) ( a – 3 ) . ( a ³ + 3a + 9 ) – ( a + 3 ) . ( a – 3a³ + 9 )
c) ( x + 4 ) . ( x² – 4x + 16 ) – ( x – 4 ) . ( x² + 4x + 16 )
Môn Toán Lớp 8: 1) Rút gọn a) ( a + b ) ³ ( a – b ) ³ b) ( a – 3 ) . ( a ³ + 3a + 9 ) – ( a + 3 ) . ( a – 3a³ + 9 ) c) ( x + 4 ) . ( x² – 4x + 16 ) –