问题 解答题
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
答案

(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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