计算或化简:
(1)()×(-36)
(2)-32×(-2)+42÷(-2)3
(3)-22-(1-×0.2)÷(-2)3
(4)
(5)-3
(6).
网友回答
解:(1)()×(-36)=-9+6-4=-7;
(2)-32×(-2)+42÷(-2)3=-9×(-2)+16÷(-8)=18-2=16;
(3)-22-(1-×0.2)÷(-2)3=-4-(1-)÷(-8)=-4+=-3;
(4)=2x-y-8x-y+2012=-6x-2y+2012;
(5)-3=-6x+3y-8x-y+2012=-14x+2y+2012;
(6)=3x2y-2[x2y-x2y+x2-2x2]=3x2y-x2y+2x2y-x2+4x2=4x2y+x2.
解析分析:(1)运用分配律计算即可;
(2)按照有理数混合运算顺序:先算乘方,再算乘除,最后算加减;
(3)按照有理数混合运算顺序:先算乘方,再算乘除,最后算加减;有括号,要先做括号内的运算;
(4)先去小括号,再合并同类项即可;
(5)先去小括号,再合并同类项即可;
(6)先去小括号,再去中括号,然后合并同类项即可.
点评:本题考查了有理数混合运算及整式的加减,是基础知识,需熟练掌握.