题目内容

脱式计算(能简算的要简算)
4
5
+
1
4
)÷
7
3
+
7
10
5
19
×
1
4
+
13
19
×
1
4
7.6×35%+6.5×0.76
13
49
×21+13×
28
49
(1)(
4
5
+
1
4
)÷
7
3
+
7
10

=
21
20
÷
7
3
+
7
10

=
9
20
+
14
20

=
23
20


(2)
5
19
×
1
4
+
13
19
×
1
4

=(
5
19
+
13
19
)×
1
4

=
18
19
×
1
4

=
9
38


(3)7.6×35%+6.5×0.76,
=7.6×0.35+0.65×7.6,
=7.6×(0.35+0.65),
=7.6×1,
=7.6;

(4)
13
49
×21+13×
28
49

=
21
49
×13+13×
28
49

=(
21
49
+
28
49
)×13,
=1×13,
=13.
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