(3x-2y)2-(3x+2y)2
题型:解答题难度:一般来源:不详
(3x-2y)2-(3x+2y)2 |
答案
(3x-2y)2-(3x+2y)2, =[(3x-2y)+(3x+2y)][(3x-2y)-(3x+2y)], =(3x-2y+3x+2y)(3x-2y-3x-2y), =6x•(-4y)=-24xy. |
举一反三
20142-2013×2015的计算结果是______. |
(x-1)(x+1)-1=______,(______-2)(3x______)=4-9x2. |
在(x-y)(x+y)=ax2+bxy-y2中,a= ,b= . |
(______)(a+b+c)=a2-(b+c)2, 0.09x2-0.6x+______=(0.3x-______)2 |
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