用简便方法计算:(1)0.9²+1.1²+1.8*1.1 (2)2013²-2012²
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用简便方法计算:(1)0.9²+1.1²+1.8*1.1 (2)2013²-2012²
用简便方法计算:(1)0.9²+1.1²+1.8*1.1 (2)2013²-2012²
用简便方法计算:(1)0.9²+1.1²+1.8*1.1 (2)2013²-2012²
0.9²+1.1²+1.8*1.1=0.9²+2*0.98*1.1+1.1²=(0.9+1.1)^2=4
2013²-2012²=(2013+2012)(2013-2012)=4025