题目内容

能简算的要简算
4
9
×[2.4-(
1
5
+
1
8
)]
1
4
×15
2
3
-1.25×15
2
3
(11-1
1
5
)÷(1-
2
5
×1
1
2
3
4
×0.75+
3
4
×0.25)÷
6
7
(1)
4
9
×[2.4-(
1
5
+
1
8
)],
=
4
9
×[2
2
5
-
13
40
],
=
4
9
×
83
40

=
83
90


(2)
1
4
×15
2
3
-1.25×15
2
3

=0.25×15
2
3
-1.25×15
2
3

=(0.25-1.25)×15
2
3

=-1×15
2
3

=-15
2
3


(3)(11-1
1
5
)÷(1-
2
5
×1
1
2
),
=
49
5
÷(1-
2
5
×
3
2
),
=
49
5
÷(1-
3
5
),
=
49
5
÷
2
5

=
49
5
×
5
2

=
49
2


(4)(
3
4
×0.75+
3
4
×0.25)÷
6
7

=[(
3
4
×(0.75+0.25)]÷
6
7

=[(
3
4
×1]×
7
6

=
3
4
×
7
6

=
7
8
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