若a+b=-1,a-b=-2010,则a2-b2=______.
题型:填空题难度:一般来源:永州模拟
若a+b=-1,a-b=-2010,则a2-b2=______. |
答案
∵a+b=-1,a-b=-2010, ∴a2-b2=(a+b)(a-b)=-1×(-2010)=2010. |
举一反三
计算0.1253×83+202×198的结果为( )A.39996 | B.39999 | C.39997 | D.40004 |
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