问题 解答题
1
2
+
5
7
×
7
10
1
2
+
8
3
÷
2
9
18×(3-
2
9
12×
3
4
+12×
1
4
1
7
+
3
8
+
6
7
+
5
8
5
4
×
1
9
+
3
4
÷9.
答案

(1)

1
2
+
5
7
×
7
10

=

1
2
+
1
2

=1;

(2)

1
2
+
8
3
÷
2
9

=

1
2
+
8
3
×
9
2

=

1
2
+12,

=12

1
2

(3)18×(3-

2
9
),

=18×3-18×

2
9

=54-4,

=50;

(4)12×

3
4
+12×
1
4

=12×(

3
4
+
1
4
),

=12×1,

=12;

(5)

1
7
+
3
8
+
6
7
+
5
8

=(

1
7
+
6
7
)+(
3
8
+
5
8
),

=1+1,

=2;

(6)

5
4
×
1
9
+
3
4
÷9,

=

5
4
×
1
9
+
3
4
×
1
9

=(

5
4
+
3
4
)×
1
9

=2×

1
9

=

2
9

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