题目内容
计算:(1)-3-6+9-11+2
(2)(
1 |
6 |
3 |
4 |
1 |
12 |
(3)(-10)-(-10)×
1 |
2 |
(4)(-1)3-(1-0.5)×
1 |
3 |
(5)(-12)÷(-
1 |
12 |
(6)8+(4-5)÷0.1
(7)-14-(1-0.5)×[2-(-3)2]
(8)36×(
1 |
2 |
1 |
3 |
(9)3.14×(-5)+3.14×(-12)+3.14×8
分析: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,计算过程中注意正负符号的变化,计算可得答案.
解答:解:(1)原式=(-3-6-11)+(2+9)
=-20+11
=-9;
(2)原式=
×(-24)-
×(-24)+
×(-24)
=-4+18-2
=14-2
=12;
(3)原式=-10-(-5)×
×(-20)
=-10-50
=-60;
(4)原式=-1-
×
×(2-9)
=-1+
=
;
(5)原式=(-12)×(-12)×(-
)
=144×(-
)
=-1.44;
(6)原式=8+(-1)×10
=8-10
=-2;
(7)原式=-1-
×(2-9)
=-1+
=
;
(8)原式=36×(
)2
=36×
=1;
(9)原式=3.14×(-5-12+8)
=3.14×(-9)
=-28.26.
=-20+11
=-9;
(2)原式=
1 |
6 |
3 |
4 |
1 |
12 |
=-4+18-2
=14-2
=12;
(3)原式=-10-(-5)×
1 |
2 |
=-10-50
=-60;
(4)原式=-1-
1 |
2 |
1 |
3 |
=-1+
7 |
6 |
=
1 |
6 |
(5)原式=(-12)×(-12)×(-
1 |
100 |
=144×(-
1 |
100 |
=-1.44;
(6)原式=8+(-1)×10
=8-10
=-2;
(7)原式=-1-
1 |
2 |
=-1+
7 |
2 |
=
5 |
2 |
(8)原式=36×(
1 |
6 |
=36×
1 |
36 |
=1;
(9)原式=3.14×(-5-12+8)
=3.14×(-9)
=-28.26.
点评:此题考查的是有理数的运算能力.注意:要正确掌握运算顺序,即先乘方运算,再乘法和除法运算,最后加法和减法运算;有括号的先算括号里面的;同级运算按从左到右的顺序.

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