问题 解答题
计算题
(
1
8
-
1
4
÷4×
1
4
1
2

②求未知数:
2
3
x+
1
2
x-
2
3
=0.5

8.6×8.6+8.6×
2
5
+8.6

1
1
3
-
7
12
+
9
20
-
11
30
+
13
42
-
15
56
答案

(

1
8
-
1
4
÷4×
1
4
1
2

=(

1
8
-
1
4
×
1
4
×
1
4
)×2,

=(

1
8
-
1
64
)×2,

=

7
64
×2,

=

7
32

2
3
x+
1
2
x-
2
3
=0.5,

7
6
x=
2
3
+
1
2

7
6
x=
7
6

x=1.

8.6×8.6+8.6×

2
5
+8.6,

=(8.6+

2
5
+1)×8.6,

=10×8.6,

=86.

1

1
3
-
7
12
+
9
20
-
11
30
+
13
42
-
15
56

=1+

1
3
-
7
12
+
9
20
-
11
30
+
13
42
-
15
56

=1+

1
3
-
3+4
3×4
+
4+5
4×5
-
5+6
5×6
+
6+7
6×7
-
7+8
7×8

=1+

1
3
-
1
3
-
1
4
+
1
4
+
1
5
-
1
5
-
1
6
+
1
6
+
1
7
-
1
7
-
1
8

=1-

1
8

=

7
8

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