ต้องการคำตอบแบบใดครับ
$(a+b)^2 \times (a-b)^2$
$(a+b)^2 \times (a-b)(a+b)$
$(a+b)^3 \times (a-b)$
$(a^3+3a^2b+3ab^2+b^3)(a-b)$
$a^4+3a^3b+3a^2b^2+ab^3-a^3b-3a^2b^2-3ab^3-b^4$
$a^4+3a^3b+ab^3-a^3b-3ab^3-b^4$
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