题目内容

脱式计算,能简算的要简算
495÷55+495÷45
5-(
6
7
÷
3
14
+
6
13
(0.7+0.7+…+0.7)
80个0.7相加
×12.5
5
8
×
11
10
+
3
8
÷
10
11
(1)495÷55+495÷45
=495÷5÷11+495÷5÷9,
=99÷11+99÷9,
=9+11,
=20;

(2)5-(
6
7
÷
3
14
+
6
13

=5-(
6
7
×
14
3
+
6
13
),
=5-(4+
6
13
),
=5-4
6
13

=
7
13



(3)
(0.7+0.7+…+0.7)
80个0.7相加
×12.5
=0.7×80×12.5,
=0.7×(80×12.5),
=0.7×1000,
=700;

(4)
5
8
×
11
10
+
3
8
÷
10
11

=
5
8
×
11
10
+
3
8
×
11
10

=(
5
8
+
3
8
)×
11
10

=1×
11
10

=
11
10
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