题目内容
800-345÷15×8+263 | 13.5÷[1.5×(1.07+1.93)] | ||||||||||||||||||||||
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| ||||||||||||||||||||||
1
|
5
| ||||||||||||||||||||||
41.2×9.2+412×0.08 | 37-0.37×8.28-3.7×0.172. |
分析:(1)、(2)运用四则混合的运算的顺序进行计算即可.
(3)运用把分数拆分为
=
+
,
=
+
,
=
+
,
=
+
,
=
+
,进行计算即可.
(4)把分数拆分为
=
-
,
=
-
,
=
-
,
=
-
,然后再进行计算会更加简便.
(5)把分数进行拆分,
=
-
,
=
-
,
=
-
,
=
-
,然后进行计算即可.
(6)运用一个数减去两个数的差,可以用这个数减去被减数加上减数,然后再运用加法的结合律及交换律进行计算即可.
(7)、(8)运用乘法的分配律进行计算即可.
(3)运用把分数拆分为
5 |
6 |
1 |
2 |
1 |
3 |
7 |
12 |
1 |
3 |
1 |
4 |
9 |
20 |
1 |
4 |
1 |
5 |
11 |
30 |
1 |
5 |
1 |
6 |
13 |
42 |
1 |
6 |
1 |
7 |
(4)把分数拆分为
2 |
15 |
1 |
3 |
1 |
5 |
3 |
40 |
1 |
5 |
1 |
8 |
4 |
96 |
1 |
8 |
1 |
12 |
5 |
204 |
1 |
12 |
1 |
17 |
(5)把分数进行拆分,
1 |
42 |
1 |
6 |
1 |
7 |
1 |
56 |
1 |
7 |
1 |
8 |
1 |
72 |
1 |
8 |
1 |
9 |
1 |
90 |
1 |
9 |
1 |
10 |
(6)运用一个数减去两个数的差,可以用这个数减去被减数加上减数,然后再运用加法的结合律及交换律进行计算即可.
(7)、(8)运用乘法的分配律进行计算即可.
解答:解:(1)800-345÷15×8+263,
=800-23×8+263,
=800-184+263,
=616+263,
=879;
(2)13.5÷[1.5×(1.07+1.93)],
=13.5÷[1.5×3],
=13.5÷4.5,
=3;
(3)
-
+
-
+
-
,
=1+
-(
+
)+(
+
)-(
+
)+(
+
)-(
+
),
=1+
-
-
+
+
-
-
+
+
-
-
,
=1-
,
=
;
(4)
-
+
-
+
,
=
-(
-
)+(
-
)-(
-
)+(
-
),
=
-
+
+
-
-
+
+
-
,
=
-
+
-
,
=
-
+
-
,
=
-
,
=
-
,
=
;
(5)1
+2
+3
+4
,
=(1+2+3+4)+(
-
+
-
+
-
+
-
),
=10+(
-
),
=10
;
(6)5
-(2.375-1
)-3
=5
-2.375+1
-3
,
=(5
+1
)-(2.375+3
),
=7-6,
=1;
(7)41.2×9.2+412×0.08,
=41.2×9.2+41.2×0.8,
=41.2×(9.2+0.8),
=41.2×10,
=412;
(8)37-0.37×8.28-3.7×0.172,
=37-(0.37×8.28-0.37×1.72),
=37-[0.37×(8.28+1.72)],
=37-3.7,
=33.3.
=800-23×8+263,
=800-184+263,
=616+263,
=879;
(2)13.5÷[1.5×(1.07+1.93)],
=13.5÷[1.5×3],
=13.5÷4.5,
=3;
(3)
3 |
2 |
5 |
6 |
7 |
12 |
9 |
20 |
11 |
30 |
13 |
42 |
=1+
1 |
2 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
4 |
1 |
4 |
1 |
5 |
1 |
5 |
1 |
6 |
1 |
6 |
1 |
7 |
=1+
1 |
2 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
4 |
1 |
4 |
1 |
5 |
1 |
5 |
1 |
6 |
1 |
6 |
1 |
7 |
=1-
1 |
7 |
=
6 |
7 |
(4)
1 |
3 |
2 |
15 |
3 |
40 |
4 |
96 |
5 |
204 |
=
1 |
3 |
1 |
3 |
1 |
5 |
1 |
5 |
1 |
8 |
1 |
8 |
1 |
12 |
1 |
12 |
1 |
17 |
=
1 |
3 |
1 |
3 |
1 |
5 |
1 |
5 |
1 |
8 |
1 |
8 |
1 |
12 |
1 |
12 |
1 |
17 |
=
2 |
5 |
1 |
4 |
1 |
6 |
1 |
17 |
=
24 |
60 |
15 |
60 |
10 |
60 |
1 |
17 |
=
19 |
60 |
1 |
17 |
=
323 |
1020 |
60 |
1020 |
=
263 |
1020 |
(5)1
1 |
42 |
1 |
56 |
1 |
72 |
1 |
90 |
=(1+2+3+4)+(
1 |
6 |
1 |
7 |
1 |
7 |
1 |
8 |
1 |
8 |
1 |
9 |
1 |
9 |
1 |
10 |
=10+(
5 |
30 |
3 |
30 |
=10
1 |
15 |
(6)5
3 |
11 |
8 |
11 |
5 |
8 |
=5
3 |
11 |
8 |
11 |
5 |
8 |
=(5
3 |
11 |
8 |
11 |
5 |
8 |
=7-6,
=1;
(7)41.2×9.2+412×0.08,
=41.2×9.2+41.2×0.8,
=41.2×(9.2+0.8),
=41.2×10,
=412;
(8)37-0.37×8.28-3.7×0.172,
=37-(0.37×8.28-0.37×1.72),
=37-[0.37×(8.28+1.72)],
=37-3.7,
=33.3.
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律简便计算.
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