问题 解答题
脱式计算.(能简算的必须简算,要有主要简算过程)
2
9
×
15
4
+
13
5
÷
4
5
)÷
7
3

184×0.25+
1
4
×15+25%
187
8
9
-(15-12
1
9

18
4
7
+6.25+7
3
7
+3.75
2
3
÷8+
1
3
×
1
8

6.43×83.8÷6.43×6.43÷83.8÷6.43.
答案

(1)(

2
9
×
15
4
+
13
5
÷
4
5
)÷
7
3

=(

2
9
×
15
4
+
13
5
×
5
4
)÷
7
3

=(

5
6
+
13
4
)×
3
7

=

49
12
×
3
7

=

7
4

(2)184×0.25+

1
4
×15+25%,

=184×0.25+0.25×15+0.25,

=(184+15+1)×0.25,

=200×0.25,

=50;

(3)187

8
9
-(15-12
1
9
),

=(187

8
9
+12
1
9
)-15,

=200-15,

=185;

(4)18

4
7
+6.25+7
3
7
+3.75,

=(18

4
7
+7
3
7
)+(3.75+6.25),

=26+10,

=36;

(5)

2
3
÷8+
1
3
×
1
8

=

2
3
×
1
8
+
1
3
×
1
8

=(

2
3
+
1
3
)×
1
8

=1×

1
8

=

1
8

(6)6.43×83.8÷6.43×6.43÷83.8÷6.43,

=(6.43÷6.43)×(83.8÷83.8)×(6.43÷6.43),

=1×1×1,

=1.

单项选择题 A1/A2型题
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