题目内容
下面各题写出计算过程 11÷[
|
| ||||||||||||||
6×1
|
(5
|
分析:(1)先算加法,再算乘法,最后算除法;
(2)根据乘法分配律进行计算;
(3)根据乘法分配律进行计算;
(4)第一个小括号里面根据加法交换律进行计算,第二个小括号里面的运用乘法分配律简算;最后算括号外的乘法.
(2)根据乘法分配律进行计算;
(3)根据乘法分配律进行计算;
(4)第一个小括号里面根据加法交换律进行计算,第二个小括号里面的运用乘法分配律简算;最后算括号外的乘法.
解答:解:
(1)11÷[
×(
+
)],
=11÷[
×
],
=11÷
,
=22;
(2)
×20+16×
-
×10,
=
×120+16×
-
×10,
=
×(120+16-10),
=
×126,
=18;
(3)6×1
+8.4÷
-1
×5,
=6×
+8.4×
-
×5,
=(6+8.4-5)×
,
=9.4×
,
=12.925;
(4)(5
-1+3
)×(7.6÷
+2
×1.25),
=(5
+3
-1)×[(7.6+2
)×1.25],
=(9-1)×[10×1.25],
=8×12.5,
=100.
(1)11÷[
6 |
11 |
3 |
4 |
1 |
6 |
=11÷[
6 |
11 |
11 |
12 |
=11÷
1 |
2 |
=22;
(2)
6 |
7 |
1 |
7 |
1 |
7 |
=
1 |
7 |
1 |
7 |
1 |
7 |
=
1 |
7 |
=
1 |
7 |
=18;
(3)6×1
3 |
8 |
8 |
11 |
3 |
8 |
=6×
11 |
8 |
11 |
8 |
11 |
8 |
=(6+8.4-5)×
11 |
8 |
=9.4×
11 |
8 |
=12.925;
(4)(5
5 |
9 |
4 |
9 |
4 |
5 |
2 |
5 |
=(5
5 |
9 |
4 |
9 |
2 |
5 |
=(9-1)×[10×1.25],
=8×12.5,
=100.
点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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