Toán Lớp 8: Rút gọn các câu sau :
1.(x+1)(x ^2 + x+1) – (x^ 3 -1)
2.(x-1)^ 3 – (x+1) ^3 +6(x-1)(x+1)
3.(x-2)^ 2 –(x+3)(x-1) + 6x
4.(x+3) ^2 – (x – 3)^ 2 -12x
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Toán Lớp 8: Rút gọn các câu sau :
1.(x+1)(x ^2 + x+1) – (x^ 3 -1)
2.(x-1)^ 3 – (x+1) ^3 +6(x-1)(x+1)
3.(x-2)^ 2 –(x+3)(x-1) + 6x
4.(x+3) ^2 – (x – 3)^ 2 -12x
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