题目内容

脱式计算,能简算的要简算.
46×8-120÷15[6.85-(0.65+0.7)]÷2.5
7
12
÷9+
1
9
×
5
12
5.58-
3
5
+5.42-
2
5
(1)46×8-120÷15,
=368-8,
=360;

(2)[6.85-(0.65+0.7)]÷2.5,
=[6.85-0.65-0.7]÷2.5,
=[6.2-0.7]÷2.5,
=5.5÷2.5,
=2.2;

(3)
7
12
÷9+
1
9
×
5
12

=
7
12
×
1
9
+
1
9
×
5
12

=(
7
12
+
5
12
)×
1
9

=1×
1
9

=
1
9


(4)5.58-
3
5
+5.42-
2
5

=(5.58+5.42)-(
3
5
+
2
5
),
=11-1,
=10.
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