(-2009)的0次方+(1/2)的-1次方+(-2)³;2a²b·(-1/2a+b²);

问题描述:

(-2009)的0次方+(1/2)的-1次方+(-2)³;2a²b·(-1/2a+b²);
(a+1)(a-1)-(a-1)²;(3a+b-2)(3a-b+2);用简便方法计算:2011²-2010×2012;现化简,再求值:()²+()()-2()(),其中a=1/2,b=-3;已知:a+b=7;ab=12,求a²+b²和(a-b)²;

(-2009)的0次方+(1/2)的-1次方+(-2)³;
=1+2-8
=-5
2a²b·(-1/2a+b²);
=-a³b+2a²b³
(a+1)(a-1)-(a-1)²;
=a²-1-a²+2a-1
=2a-2
(3a+b-2)(3a-b+2);
=[3a+(b-2)][3a-(b-2)]
=9a²-(b-2)²
=9a²-b²+4b-4
用简便方法计算:2011²-2010×2012;
=2011²-(2011-1)(2011+1)
=2011²-2011²+1
=1
现化简,再求值:()²+()()-2()(),其中a=1/2,b=-3;
这个不知道了
已知:a+b=7;ab=12,求a²+b²和(a-b)²
a²+b²=(a+b)²-2ab=49-24=25
(a-b)²=a²-2ab+b²=25-24=1