题目内容
①| 5 |
| 6 |
| 3 |
| 4 |
| 2 |
| 3 |
| 1 |
| 2 |
②23÷(-
| 4 |
| 9 |
| 2 |
| 3 |
③(-3)2×23-(-4)÷2
④(
| 1 |
| 4 |
| 1 |
| 36 |
| 1 |
| 6 |
| 1 |
| 12 |
| 1 |
| 48 |
⑤-14÷(-5)2×(-
| 5 |
| 3 |
分析:①先通分再计算;
②先乘方再乘除;
③先乘方再乘除,最后加减;
④先转化为乘法,再利用乘法运算律计算;
⑤先乘方再乘除,最后加减.
②先乘方再乘除;
③先乘方再乘除,最后加减;
④先转化为乘法,再利用乘法运算律计算;
⑤先乘方再乘除,最后加减.
解答:解:①
-
+
-
,
=
-
+
-
,
=
=
;
②23÷(-
)×(-
)2,
=8×(-
)×
,
=-8;
③(-3)2×23-(-4)÷2,
=9×8+2,
=74;
④(
-
-
-
)÷(-
),
=(
-
-
-
)×(-48),
=-12+
+8+4,
=
;
⑤-14÷(-5)2×(-
)+|0.8-1|,
=-1×
×(-
)+
,
=
.
| 5 |
| 6 |
| 3 |
| 4 |
| 2 |
| 3 |
| 1 |
| 2 |
=
| 10 |
| 12 |
| 9 |
| 12 |
| 8 |
| 12 |
| 6 |
| 12 |
=
| 3 |
| 12 |
| 1 |
| 4 |
②23÷(-
| 4 |
| 9 |
| 2 |
| 3 |
=8×(-
| 9 |
| 4 |
| 4 |
| 9 |
=-8;
③(-3)2×23-(-4)÷2,
=9×8+2,
=74;
④(
| 1 |
| 4 |
| 1 |
| 36 |
| 1 |
| 6 |
| 1 |
| 12 |
| 1 |
| 48 |
=(
| 1 |
| 4 |
| 1 |
| 36 |
| 1 |
| 6 |
| 1 |
| 12 |
=-12+
| 4 |
| 3 |
=
| 4 |
| 3 |
⑤-14÷(-5)2×(-
| 5 |
| 3 |
=-1×
| 1 |
| 25 |
| 5 |
| 3 |
| 1 |
| 5 |
=
| 4 |
| 15 |
点评:本题主要考查了有理数的混合运算.对于不同级的混合运算,一般先算较高级的运算,再算较低级的运算,有括号,先算括号;对于同级的混合运算,一般按照从左往右的顺序依次进行;能够利用运算律的,利用运算律可使计算简便.
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