计算:(a+b)(a-b)+(a+b)².计算:(5-x)(-5-x)计算:(-2xy)²+3xy×4xy²+(-2x)用乘法公式计算:540²-543×537
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![计算:(a+b)(a-b)+(a+b)².计算:(5-x)(-5-x)计算:(-2xy)²+3xy×4xy²+(-2x)用乘法公式计算:540²-543×537](/uploads/image/z/10309401-9-1.jpg?t=%E8%AE%A1%E7%AE%97%3A%28a%2Bb%29%28a-b%29%2B%28a%2Bb%29%26%23178%3B.%E8%AE%A1%E7%AE%97%3A%285-x%29%28-5-x%29%E8%AE%A1%E7%AE%97%3A%28-2xy%29%26%23178%3B%2B3xy%C3%974xy%26%23178%3B%2B%28-2x%29%E7%94%A8%E4%B9%98%E6%B3%95%E5%85%AC%E5%BC%8F%E8%AE%A1%E7%AE%97%3A540%26%23178%3B-543%C3%97537)
计算:(a+b)(a-b)+(a+b)².计算:(5-x)(-5-x)计算:(-2xy)²+3xy×4xy²+(-2x)用乘法公式计算:540²-543×537
计算:(a+b)(a-b)+(a+b)².
计算:(5-x)(-5-x)
计算:(-2xy)²+3xy×4xy²+(-2x)
用乘法公式计算:540²-543×537
计算:(a+b)(a-b)+(a+b)².计算:(5-x)(-5-x)计算:(-2xy)²+3xy×4xy²+(-2x)用乘法公式计算:540²-543×537
(a+b)(a-b)+(a+b)².=a²-b²+a²+2ab+b²=2a²+2ab
(5-x)(-5-x)=(-x+5)(-x-5)=x²-25
(-2xy)²+3xy×4xy²+(-2x)=4x²y²+12x²y³-2x
540²-543×537=540²-(540+3)(540-3)=540²-540²+9=9
计算:(5-x)(-5-x)
=25-10x+x^2
计算:(-2xy)²+3xy×4xy²+(-2x)
=4x²y²+12x²y^3-2x
用乘法公式计算:540²-543×537
=540²-(540+...
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计算:(5-x)(-5-x)
=25-10x+x^2
计算:(-2xy)²+3xy×4xy²+(-2x)
=4x²y²+12x²y^3-2x
用乘法公式计算:540²-543×537
=540²-(540+3)(540-3)
=540²-(540²-3²)
=540²-540²+9
=9
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(a+b)(a-b)+(a+b)².=a²-b²+a²+2ab+b²=2a²+2ab
(5-x)(-5-x)=x²-25
(-2xy)²+3xy×4xy²+(-2x)=4x²y²+12x²y³-2x
540²-543×537=540²-(540+3)(540-3)=540²-540²+9=9
(a+b)(a-b)+(a+b)².=a²-b²+a²+2ab+b²=2a²+2ab
(5-x)(-5-x)=(-x+5)(-x-5) ...
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(a+b)(a-b)+(a+b)².=a²-b²+a²+2ab+b²=2a²+2ab
(5-x)(-5-x)=(-x+5)(-x-5)
-25(-2xy)²+3xy×4xy²+(-2x)=4x²y²+12x²y³-2x
540²-543×537=540²-(540+3)(540-3)=540²-540²+9=9 nkjkgbjhmnbuh
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