题目内容
计算题:
①-24÷|-4|×(-
)-(-1)2012÷0.5
②
×(-13)-
×(-2)3
.
解:①-24÷|-4|×(-
)-(-1)2012÷0.5
=-16÷4×(-
)-1÷0.5
=2-2
=0;
②
×(-13)-
×(-2)3
=
×(-13)-
×(-8)+
×3
=
×(-13+8+3)
=
×(2)
=-
.
分析:①按照有理数混合运算的顺序,先绝对值、乘方后乘除最后算加减,有括号的先算括号里面的;
②按照有理数混合运算的顺序,先乘方后乘除最后算加减,有括号的先算括号里面的.
点评:本题考查的是有理数的运算能力.
注意:
(1)要正确掌握运算顺序,在混合运算中要特别注意运算顺序:先三级,后二级,再一级;有括号的先算括号里面的;同级运算按从左到右的顺序;
(2)去括号法则:--得+,-+得-,++得+,+-得-.
(3)整式中如果有多重括号应按照先去小括号,再去中括号,最后大括号的顺序进行.

=-16÷4×(-

=2-2
=0;
②



=



=

=

=-

分析:①按照有理数混合运算的顺序,先绝对值、乘方后乘除最后算加减,有括号的先算括号里面的;
②按照有理数混合运算的顺序,先乘方后乘除最后算加减,有括号的先算括号里面的.
点评:本题考查的是有理数的运算能力.
注意:
(1)要正确掌握运算顺序,在混合运算中要特别注意运算顺序:先三级,后二级,再一级;有括号的先算括号里面的;同级运算按从左到右的顺序;
(2)去括号法则:--得+,-+得-,++得+,+-得-.
(3)整式中如果有多重括号应按照先去小括号,再去中括号,最后大括号的顺序进行.

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