Toán Lớp 8: Rút gọn biểu thức :
A = ( x^2 – 1 )( x + 2 ) – ( x – 2 )( x^2 + 2x + 4 )
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Toán Lớp 8: Rút gọn biểu thức :
A = ( x^2 – 1 )( x + 2 ) – ( x – 2 )( x^2 + 2x + 4 )
Comments ( 2 )
= x ^ 3 + 2 x ^ 2 – x – 2 – ( x ^ 3 – 2 ^ 3 )
= x ^ 3 + 2 x ^ 2 – x – 2 – x ^ 3 + 8
= 2 x ^ 2 – x + 6