Toán Lớp 8: a. x³+x²z+y²z-xyz+y³ b. bc(b+c)+ca(c-a)-ab(a+b) c. a²(b-c)+b²(c-a)+c²(a-c) -

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Toán Lớp 8: a. x³+x²z+y²z-xyz+y³ b. bc(b+c)+ca(c-a)-ab(a+b) c. a²(b-c)+b²(c-a)+c²(a-c)