Toán Lớp 8: rút gọn các biểu thức sau:
a) (x-3)(x^2+3x+9)-(54+x^3)
b) (3x+y)(9x^2+3xy+y^2)-(3x-y)(9x^2+3xy+y^2)
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Toán Lớp 8: rút gọn các biểu thức sau:
a) (x-3)(x^2+3x+9)-(54+x^3)
b) (3x+y)(9x^2+3xy+y^2)-(3x-y)(9x^2+3xy+y^2)
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