问题 解答题
4
5
÷(
5
8
-
1
2
)÷
5
8

4.72-1.16-2.84
2-
6
13
×
26
9
-
2
3

375+450÷18×25
3(x-2.1)=8.4
x-
3
4
x=
3
5
答案

4
5
÷(
5
8
-
1
2
)÷
5
8

=

4
5
÷
1
8
÷
5
8

=

4
5
×8×
8
5

=

256
25

4.72-1.16-2.84,

=4.72-(1.16+2.84),

=4.72-4,

=0.72;

2-

6
13
×
26
9
-
2
3

=2-(

4
3
+
2
3
),

=2-2,

=0;

375+450÷18×25

=375+25×25

=375+625

=1000;

3(x-2.1)=8.4,

x-2.1=2.8,

x=2.8+2.1,

x=4.9;

x-

3
4
x=
3
5

1
4
x=
3
5

x=

3
5
÷
1
4

x=

12
5

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