题目内容
计算题:(1)(-180)+(+20);
(2)-40-28-(-19)+(-24);
(3)(-81)÷
9 |
4 |
4 |
9 |
(4)(-24)×(-
1 |
8 |
1 |
3 |
1 |
6 |
(5)-|-9|×|-1
2 |
3 |
(6)99
35 |
36 |
分析:此题主要利用有理数混合运算的法则进行计算,有理数混合运算顺序是:先乘方,再乘除,最后加减,有括号的先算括号里的.
解答:解:(1)原式=-(180-20)
=-160;
(2)原式=-40-28+19-24
=-73;
(3)原式=(-81)×
×
×(-
)
=-36×
×(-
)
=-16×(-
)
=1;
(4)原式=(-24)×(-
)+(-24)×
+(-24)×(-
)
=3+(-8)+4
=-5+4
=-1;
(5)原式=9×
+10
=15+10
=25;
(6)原式=(100-
)×36
=100×36-
×36
=3600-1
=3599.
=-160;
(2)原式=-40-28+19-24
=-73;
(3)原式=(-81)×
4 |
9 |
4 |
9 |
1 |
16 |
=-36×
4 |
9 |
1 |
16 |
=-16×(-
1 |
16 |
=1;
(4)原式=(-24)×(-
1 |
8 |
1 |
3 |
1 |
6 |
=3+(-8)+4
=-5+4
=-1;
(5)原式=9×
5 |
3 |
=15+10
=25;
(6)原式=(100-
1 |
36 |
=100×36-
1 |
36 |
=3600-1
=3599.
点评:在进行有理数混合运算时除掌握正确的运算顺序外,还需要能合理适时的运用运算律使计算简便.
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