①(x-2y)²乘(x+2y)²②(a-3)²—(a+3)²以上题能用简便方法用简便方法,
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![①(x-2y)²乘(x+2y)²②(a-3)²—(a+3)²以上题能用简便方法用简便方法,](/uploads/image/z/1743023-47-3.jpg?t=%E2%91%A0%28x-2y%29%26%23178%3B%E4%B9%98%28x%2B2y%29%26%23178%3B%E2%91%A1%EF%BC%88a-3%29%26%23178%3B%E2%80%94%EF%BC%88a%2B3%EF%BC%89%26%23178%3B%E4%BB%A5%E4%B8%8A%E9%A2%98%E8%83%BD%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%2C)
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①(x-2y)²乘(x+2y)²②(a-3)²—(a+3)²以上题能用简便方法用简便方法,
①(x-2y)²乘(x+2y)²②(a-3)²—(a+3)²以上题能用简便方法用简便方法,
①(x-2y)²乘(x+2y)²②(a-3)²—(a+3)²以上题能用简便方法用简便方法,
①(x-2y)²乘(x+2y)²
=[(X-2Y)(X+2Y)]²
=(X²-4Y²)²
=X^4-8X²Y²+16Y^4
②(a-3)²—(a+3)²
=[(a-3)+(a+3)][(a-3)-(a+3)]
=2a×(-6)
=-12a