题目内容
计算下面各题.
5.4÷[14.65-(11.65+2.1)]
9.6-11÷7+
×4
×[1-(
-
)]
36÷[(
-
)×3].
5.4÷[14.65-(11.65+2.1)]
9.6-11÷7+
1 |
7 |
4 |
13 |
3 |
4 |
3 |
8 |
36÷[(
5 |
6 |
1 |
3 |
考点:小数四则混合运算,分数的四则混合运算
专题:运算顺序及法则
分析:(1)中括号里面根据减法的性质进行简算,最后算除法;
(2)先算除法和乘法,再根据加法结合律进行简算;
(3)先算小括号里面的减法,再算中括号里面的减法,最后算乘法;
(4)先算减法,再算乘法,最后算除法.
(2)先算除法和乘法,再根据加法结合律进行简算;
(3)先算小括号里面的减法,再算中括号里面的减法,最后算乘法;
(4)先算减法,再算乘法,最后算除法.
解答:
解:(1)5.4÷[14.65-(11.65+2.1)]
=5.4÷[14.65-11.65-2.1]
=5.4÷[3-2.1]
=5.4÷0.9
=6;
(2)9.6-11÷7+
×4
=9.6-
+
=9.6-(
-
)
=9.6-1
=8.6;
(3)
×[1-(
-
)]
=
×[1-
]
=
×
=
;
(4)36÷[(
-
)×3].
=36÷[
×3].
=36÷
=24.
=5.4÷[14.65-11.65-2.1]
=5.4÷[3-2.1]
=5.4÷0.9
=6;
(2)9.6-11÷7+
1 |
7 |
=9.6-
11 |
7 |
4 |
7 |
=9.6-(
11 |
7 |
4 |
7 |
=9.6-1
=8.6;
(3)
4 |
13 |
3 |
4 |
3 |
8 |
=
4 |
13 |
3 |
8 |
=
4 |
13 |
5 |
8 |
=
5 |
26 |
(4)36÷[(
5 |
6 |
1 |
3 |
=36÷[
1 |
2 |
=36÷
3 |
2 |
=24.
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
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