问题 解答题
直接写计算结果
12.5×
1
7
×0.56
=
9
5
7
-3
4
9
+2
4
9
-8
3
7
=
2
5
7
-(
3
5
-
2
7
)
=
7800×8÷36×108÷26=
1
6
+
1
12
+
1
20
+
1
30
=
1
1
9
+2
1
90
+3
1
900
=
答案

(1)12.5×

1
7
×0.56=1;

(2)9

5
7
-3
4
9
+2
4
9
-8
3
7

=(9

5
7
-8
3
7
)-(3
4
9
-2
4
9
),

=1

2
7
-1,

=

2
7

(3)2

5
7
-(
3
5
-
2
7
),

=2

5
7
-
3
5
+
2
7

=27+

2
7
-
3
5

=3-

3
5

=2

2
5

(4)7800×8÷36×108÷26,

=7800×8×

1
36
×108×
1
26

=7200;

(5)

1
6
+
1
12
+
1
20
+
1
30

=

1
2
-
1
3
+
1
3
-
1
4
+
1
4
-
1
5
+
1
5
-
1
6

=

1
2
-
1
6

=

1
3

(6)1

1
9
+2
1
90
+3
1
900

=(1+2+3)+(

1
9
+
1
90
+
1
900
),

=6+

37
300

=6

37
300

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