题目内容
加减乘除乘方混合运算
(1)(-2)2+3×(-2)-1÷(
)
(2)|-4|-(-2)2-(-1)2013-1÷2
(3)(-2)3×8-8×(
)3+8
(4)(-1)4-[(1-0.7)×(
)]×[3-(-2)2]
(5)(-
)2×3-4÷(-
)×
+8×(
)2
(6)1-32-2-|(-2)3+9|
(7)3×(-2)3-24÷(-2)2
(8)[(-1)5÷
-
]×[1-(-
)2].
(1)(-2)2+3×(-2)-1÷(
| 1 |
| 4 |
(2)|-4|-(-2)2-(-1)2013-1÷2
(3)(-2)3×8-8×(
| 1 |
| 2 |
| 1 |
| 8 |
(4)(-1)4-[(1-0.7)×(
| 1 |
| 3 |
(5)(-
| 2 |
| 3 |
| 3 |
| 5 |
| 3 |
| 5 |
| 3 |
| 2 |
(6)1-32-2-|(-2)3+9|
(7)3×(-2)3-24÷(-2)2
(8)[(-1)5÷
| 4 |
| 3 |
| 1 |
| 4 |
| 1 |
| 3 |
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
解答:解:(1)(-2)2+3×(-2)-1÷(
)
=4-6-4
=-6;
(2)|-4|-(-2)2-(-1)2013-1÷2
=4-4+1-
=
;
(3)(-2)3×8-8×(
)3+8
=-8×8-8×
+8
=-64-1+8
=-56
;
(4)(-1)4-[(1-0.7)×(
)]×[3-(-2)2]
=1-[0.3×
]×[3-4]
=1-0.1×(-1)
=1+0.1
=1.1;
(5)(-
)2×3-4÷(-
)×
+8×(
)2
=
×3+4×
×
+8×
=
+4+18
=23
;
(6)1-32-2-|(-2)3+9|
=1-9-2-|-8+9|
=1-9-2-1
=-11;
(7)3×(-2)3-24÷(-2)2
=3×(-8)-24÷4
=-24-6
=-30;
(8)[(-1)5÷
-
]×[1-(-
)2]
=[-1×
-
]×[1-
]
=[-
-
]×
=-1×
=-
.
| 1 |
| 4 |
=4-6-4
=-6;
(2)|-4|-(-2)2-(-1)2013-1÷2
=4-4+1-
| 1 |
| 2 |
=
| 1 |
| 2 |
(3)(-2)3×8-8×(
| 1 |
| 2 |
| 1 |
| 8 |
=-8×8-8×
| 1 |
| 8 |
| 1 |
| 8 |
=-64-1+8
| 1 |
| 8 |
=-56
| 7 |
| 8 |
(4)(-1)4-[(1-0.7)×(
| 1 |
| 3 |
=1-[0.3×
| 1 |
| 3 |
=1-0.1×(-1)
=1+0.1
=1.1;
(5)(-
| 2 |
| 3 |
| 3 |
| 5 |
| 3 |
| 5 |
| 3 |
| 2 |
=
| 4 |
| 9 |
| 5 |
| 3 |
| 3 |
| 5 |
| 9 |
| 4 |
=
| 4 |
| 3 |
=23
| 1 |
| 3 |
(6)1-32-2-|(-2)3+9|
=1-9-2-|-8+9|
=1-9-2-1
=-11;
(7)3×(-2)3-24÷(-2)2
=3×(-8)-24÷4
=-24-6
=-30;
(8)[(-1)5÷
| 4 |
| 3 |
| 1 |
| 4 |
| 1 |
| 3 |
=[-1×
| 3 |
| 4 |
| 1 |
| 4 |
| 1 |
| 9 |
=[-
| 3 |
| 4 |
| 1 |
| 4 |
| 8 |
| 9 |
=-1×
| 8 |
| 9 |
=-
| 8 |
| 9 |
点评:本题考查的是有理数的运算与整式的加减运算.注意:要正确掌握运算顺序,即乘方运算(和以后学习的开方运算)叫做三级运算;乘法和除法叫做二级运算;加法和减法叫做一级运算.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.
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