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
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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