题目内容

脱式计算:
[1-(
1
2
-
1
4
)]×
2
3

(51+
34
35
)÷17
3
4
:X=3:12

38×
1
4
+17×0.25+45×25%
2
5
:X=(1+
1
7
):5.
(1)[1-(
1
2
-
1
4
)]×
2
3

=[1-
1
4
2
3

=
3
4
×
2
3

=
1
2


(2)(51+
34
35
)÷17,
=(51+
34
35
)×
1
17

=51×
1
17
+
34
35
×
1
17

=3+
2
35

=3
2
35


(3)
3
4
:X=3:12

3x=
3
4
×12,
3x=9,
3x÷3=9÷3,
x=3;

(4)38×
1
4
+17×0.25+45×25%,
=(38+17+45)×0.25,
=100×0.25,
=25;

(5)
2
5
:X=(1+
1
7
):5,
2
5
:X=
8
7
:5,
8
7
X=
2
5
×5,
8
7
X=2,
8
7
8
7
=2÷
8
7

X=
7
4
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