200.5×199.5=______.
题型:填空题难度:一般来源:不详
200.5×199.5=______. |
答案
200.5×199.5, =(200+0.5)×(200-0.5) =2002-0.52, =40000-0.25, =39999.75. 故答案为:39999.75. |
举一反三
如(3a+3b+1)(3a+3b-1)=80,则a+b=______. |
a2•(-a3)=______;(a+2b)(a-2b)=______. |
(a-b)(a+b)(a2+b2)(a4+b4)(a8+b8) |
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