题目内容
(2012?武定县模拟)脱式计算.(能简算的要简算)
4.5×4-414÷23=
75×
+25×
=
(
-
+
)÷
=
1110÷[56×(
-
)]=
×(
+
÷
)=
;
÷[
×(2-
)].
4.5×4-414÷23=
0
0
;75×
3 |
5 |
3 |
5 |
60
60
; (
1 |
10 |
1 |
12 |
1 |
15 |
1 |
60 |
5
5
;1110÷[56×(
3 |
7 |
3 |
8 |
370
370
;4 |
15 |
3 |
8 |
6 |
5 |
8 |
5 |
3 |
10 |
3 |
10 |
8 |
25 |
4 |
9 |
7 |
5 |
分析:(1)先算乘除,再算减法;
(2)运用乘法分配律简算;
(3)把除法改为乘法,运用乘法分配律简算;
(4)中括号内运用乘法分配律简算,再算括号外的除法;
(5)先算括号内的除法,再算括号内的加法,最后算括号外的乘法;
(6)先算小括号里的,再算中括号内的,最后算括号外的.
(2)运用乘法分配律简算;
(3)把除法改为乘法,运用乘法分配律简算;
(4)中括号内运用乘法分配律简算,再算括号外的除法;
(5)先算括号内的除法,再算括号内的加法,最后算括号外的乘法;
(6)先算小括号里的,再算中括号内的,最后算括号外的.
解答:解:(1)4.5×4-414÷23,
=18-18,
=0;
(2)75×
+25×
,
=(75+25)×
,
=100×
,
=60;
(3)(
-
+
)÷
,
=(
-
+
)×60,
=
×60-
×60+
×60,
=6-5+4,
=5;
(4)1110÷[56×(
-
)],
=1110÷[56×
-56×
],
=1110÷[24-21],
=1110÷3,
=370;
(5)
×(
+
÷
),
=
×(
+
×
),
=
×(
+
),
=
×
,
=
;
(6)
÷[
×(2-
)],
=
÷[
×
],
=
÷
,
=
×
,
=
.
=18-18,
=0;
(2)75×
3 |
5 |
3 |
5 |
=(75+25)×
3 |
5 |
=100×
3 |
5 |
=60;
(3)(
1 |
10 |
1 |
12 |
1 |
15 |
1 |
60 |
=(
1 |
10 |
1 |
12 |
1 |
15 |
=
1 |
10 |
1 |
12 |
1 |
15 |
=6-5+4,
=5;
(4)1110÷[56×(
3 |
7 |
3 |
8 |
=1110÷[56×
3 |
7 |
3 |
8 |
=1110÷[24-21],
=1110÷3,
=370;
(5)
4 |
15 |
3 |
8 |
6 |
5 |
8 |
5 |
=
4 |
15 |
3 |
8 |
6 |
5 |
5 |
8 |
=
4 |
15 |
3 |
8 |
6 |
8 |
=
4 |
15 |
9 |
8 |
=
3 |
10 |
(6)
8 |
25 |
4 |
9 |
7 |
5 |
=
8 |
25 |
4 |
9 |
3 |
5 |
=
8 |
25 |
4 |
15 |
=
8 |
25 |
15 |
4 |
=
6 |
5 |
点评:此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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