问题 解答题
计算:
4x-7×1.3=9.9
1
1
2
:0.4=1.35:X
3-
1
9
×1
1
2
+
5
6
0.9-(0.15+0.35÷
5
7
7.25-3
3
7
+3.75-6
4
7
(2-
3
4
×
4
5
)÷(
1
12
+
4
15
答案

(1)4x-7×1.3=9.9,

4x-9.1=9.9,

4x-9.1+9.1=9.9+9.1,

4x÷4=19÷4,

x=4.75;

(2)1

1
2
:0.4=1.35:X,

1

1
2
X=0.4×1.35,

3
2
2
3
=0.54×
2
3

X=0.36;

(3)3-

1
9
×1
1
2
+
5
6

=3-

1
6
+
5
6

=3

2
3

(4)0.9-(0.15+0.35÷

5
7
),

=0.9-(0.15+0.49),

=0.9-0.64,

=0.26.

(5)7.25-3

3
7
+3.75-6
4
7

=(7.25+3.75)-(3

3
7
+6
4
7
),

=11-10,

=1;

(6)(2-

3
4
×
4
5
)÷(
1
12
+
4
15
),

=(2-

3
5
)÷
7
20

=

7
5
×
20
7

=4.

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