Toán Lớp 8: thực hiện phép tính
a) ( x – 2 )( x + 2 ) – x ( x + 5 )
b) ( 3x mũ 4 y mũ 2 + 6x mũ 2 y mũ 3 – 15x mũ 2 y mũ 2 ) : 3x mũ 2 y
c) ( 3x mũ 3 – 5x mũ 2 – 9x – 9 ) : ( x – 3 )
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Toán Lớp 8: thực hiện phép tính
a) ( x – 2 )( x + 2 ) – x ( x + 5 )
b) ( 3x mũ 4 y mũ 2 + 6x mũ 2 y mũ 3 – 15x mũ 2 y mũ 2 ) : 3x mũ 2 y
c) ( 3x mũ 3 – 5x mũ 2 – 9x – 9 ) : ( x – 3 )
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