题目内容
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1÷
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4
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(
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分析:(1)把除法变成乘法,再运用乘法结合律简算;
(2)先把除法变成乘法,再运用乘法分配律简算;
(3)先算小括号里面的加法,再算括号外的除法;
(4)(5)按照从左到右的顺序计算;
(6)(8)运用乘法分配律简算;
(7)先把46分解成45+1,再运用乘法分配律简算.
(2)先把除法变成乘法,再运用乘法分配律简算;
(3)先算小括号里面的加法,再算括号外的除法;
(4)(5)按照从左到右的顺序计算;
(6)(8)运用乘法分配律简算;
(7)先把46分解成45+1,再运用乘法分配律简算.
解答:解:(1)
×14÷
,
=
×(14×
),
=
×16,
=2;
(2)(
+
)÷
,
=(
+
)×
,
=
×
+
×
,
=
+1,
=3
;
(3)
÷(
+
),
=
÷
,
=
;
(4)
÷
÷
,
=
×
×
,
=
×
,
=
;
(5)1÷
÷
,
=100×100,
=10000;
(6)4
×4
-4
×3.6,
=4
×(4
-3.6),
=4
×1,
=4
;
(7)
×46,
=
×(45+1),
=
×45+
×1,
=44+
,
=44
;
(8)(
+
+
)×24,
=
×24+
×24+
×24,
=12+16+18,
=28+18,
=46.
1 |
8 |
7 |
8 |
=
1 |
8 |
8 |
7 |
=
1 |
8 |
=2;
(2)(
4 |
5 |
3 |
10 |
3 |
10 |
=(
4 |
5 |
3 |
10 |
10 |
3 |
=
4 |
5 |
10 |
3 |
3 |
10 |
10 |
3 |
=
8 |
3 |
=3
2 |
3 |
(3)
5 |
6 |
1 |
2 |
5 |
6 |
=
5 |
6 |
8 |
6 |
=
5 |
8 |
(4)
3 |
4 |
15 |
16 |
5 |
6 |
=
3 |
4 |
16 |
15 |
6 |
5 |
=
4 |
5 |
6 |
5 |
=
24 |
25 |
(5)1÷
1 |
100 |
1 |
100 |
=100×100,
=10000;
(6)4
4 |
5 |
3 |
5 |
4 |
5 |
=4
4 |
5 |
3 |
5 |
=4
4 |
5 |
=4
4 |
5 |
(7)
44 |
45 |
=
44 |
45 |
=
44 |
45 |
44 |
45 |
=44+
44 |
45 |
=44
44 |
45 |
(8)(
1 |
2 |
2 |
3 |
3 |
4 |
=
1 |
2 |
2 |
3 |
3 |
4 |
=12+16+18,
=28+18,
=46.
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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