运用平方差公式计算 (1)200.02*199.8 (2)2005²-2004+*2006
解方程:(-3x-2分之1)(2分之1-3x)=x(9x-5分之1)
人气:254 ℃ 时间:2019-08-21 18:23:50
解答
(1)200.02*199.8
=(200+0.02)(200-0.02)
=200²-0.02²
2)2005²-2004+*2006
=2005²-(2005-1)(2005+1)
=2005²-(2005²-1)
=1
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