题目内容
用递等式计算.(能简算的要简算)
(1)(32×106-352)÷38
(2)
×
+
×
(3)(
-
)×(0.25+
)
(4)(
+
)×
-
(5)4
+5.375+5
+2
(6)7.8÷[32×(1-
)+3.6).
(1)(32×106-352)÷38
(2)
13 |
16 |
5 |
6 |
5 |
6 |
3 |
16 |
(3)(
5 |
6 |
4 |
9 |
5 |
7 |
(4)(
4 |
5 |
1 |
4 |
3 |
7 |
3 |
40 |
(5)4
1 |
3 |
2 |
3 |
5 |
8 |
(6)7.8÷[32×(1-
5 |
8 |
分析:(1)先算乘法,再算减法,最后算除法;
(2)根据乘法分配律进行计算;
(3)先算减法和加法,再算乘法;
(4)先算加法,再算乘法,最后算减法;
(5)根据加法交换律和结合律进行计算;
(6)先算减法,再算乘法,再算加法,最后算除法.
(2)根据乘法分配律进行计算;
(3)先算减法和加法,再算乘法;
(4)先算加法,再算乘法,最后算减法;
(5)根据加法交换律和结合律进行计算;
(6)先算减法,再算乘法,再算加法,最后算除法.
解答:解:
(1)(32×106-352)÷38,
=(3392-352)÷38,
=3040÷38,
=80;
(2)
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(3)(
-
)×(0.25+
),
=
×
,
=
;
(4)(
+
)×
-
,
=
×
-
,
=
-
,
=
;
(5)4
+5.375+5
+2
,
=(4
+5
)+(5.375+2
),
=10+8,
=18;
(6)7.8÷[32×(1-
)+3.6),
=7.8÷[32×
+3.6],
=7.8÷[12+3.6],
=7.8÷15.6,
=0.5.
(1)(32×106-352)÷38,
=(3392-352)÷38,
=3040÷38,
=80;
(2)
13 |
16 |
5 |
6 |
5 |
6 |
3 |
16 |
=(
13 |
16 |
3 |
16 |
5 |
6 |
=1×
5 |
6 |
=
5 |
6 |
(3)(
5 |
6 |
4 |
9 |
5 |
7 |
=
7 |
18 |
27 |
28 |
=
3 |
8 |
(4)(
4 |
5 |
1 |
4 |
3 |
7 |
3 |
40 |
=
21 |
20 |
3 |
7 |
3 |
40 |
=
9 |
20 |
3 |
40 |
=
3 |
8 |
(5)4
1 |
3 |
2 |
3 |
5 |
8 |
=(4
1 |
3 |
2 |
3 |
5 |
8 |
=10+8,
=18;
(6)7.8÷[32×(1-
5 |
8 |
=7.8÷[32×
3 |
8 |
=7.8÷[12+3.6],
=7.8÷15.6,
=0.5.
点评:此题主要考查整数、分数、小数的四则混合运算的运算顺序和应用运算定律进行简便计算.
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