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能简算的要简算1349×21+28×1349;(34+58)×32;72×571.

题目详情
能简算的要简算
13
49
×21+28×
13
49
;               (
3
4
+
5
8
)×32;             72×
5
71
能简算的要简算
13
49
×21+28×
13
49
;               (
3
4
+
5
8
)×32;             72×
5
71

13
49
×21+28×
13
49
;               (
3
4
+
5
8
)×32;             72×
5
71
13
49
134913134949
13
49
;               (
3
4
+
5
8
)×32;             72×
5
71
13
49
134913134949
3
4
+
5
8
)×32;             72×
5
71
3
4
343344
5
8
)×32;             72×
5
71
5
8
585588
5
71
5
71
571557171
▼优质解答
答案和解析
(1)
13
49
×21+28×
13
49

=
13
49
×(21+28)
=
13
49
×49
=13

(2)(
3
4
+
5
8
)×32
=
3
4
×32+
5
8
×32
=24+20
=44

(3)72×
5
71

=(71+1)×
5
71

=71×
5
71
+1×
5
71

=5+
5
71

=5
5
71
13
49
1349131313494949×21+28×
13
49

=
13
49
×(21+28)
=
13
49
×49
=13

(2)(
3
4
+
5
8
)×32
=
3
4
×32+
5
8
×32
=24+20
=44

(3)72×
5
71

=(71+1)×
5
71

=71×
5
71
+1×
5
71

=5+
5
71

=5
5
71
13
49
1349131313494949
=
13
49
×(21+28)
=
13
49
×49
=13

(2)(
3
4
+
5
8
)×32
=
3
4
×32+
5
8
×32
=24+20
=44

(3)72×
5
71

=(71+1)×
5
71

=71×
5
71
+1×
5
71

=5+
5
71

=5
5
71
13
49
1349131313494949×(21+28)
=
13
49
×49
=13

(2)(
3
4
+
5
8
)×32
=
3
4
×32+
5
8
×32
=24+20
=44

(3)72×
5
71

=(71+1)×
5
71

=71×
5
71
+1×
5
71

=5+
5
71

=5
5
71
13
49
1349131313494949×49
=13

(2)(
3
4
+
5
8
)×32
=
3
4
×32+
5
8
×32
=24+20
=44

(3)72×
5
71

=(71+1)×
5
71

=71×
5
71
+1×
5
71

=5+
5
71

=5
5
71
3
4
34333444+
5
8
)×32
=
3
4
×32+
5
8
×32
=24+20
=44

(3)72×
5
71

=(71+1)×
5
71

=71×
5
71
+1×
5
71

=5+
5
71

=5
5
71
5
8
58555888)×32
=
3
4
×32+
5
8
×32
=24+20
=44

(3)72×
5
71

=(71+1)×
5
71

=71×
5
71
+1×
5
71

=5+
5
71

=5
5
71
3
4
34333444×32+
5
8
×32
=24+20
=44

(3)72×
5
71

=(71+1)×
5
71

=71×
5
71
+1×
5
71

=5+
5
71

=5
5
71
32+
5
8
58555888×32
=24+20
=44

(3)72×
5
71

=(71+1)×
5
71

=71×
5
71
+1×
5
71

=5+
5
71

=5
5
71
5
71
571555717171
=(71+1)×
5
71

=71×
5
71
+1×
5
71

=5+
5
71

=5
5
71
5
71
571555717171
=71×
5
71
+1×
5
71

=5+
5
71

=5
5
71
5
71
571555717171+1×
5
71

=5+
5
71

=5
5
71
5
71
571555717171
=5+
5
71

=5
5
71
5
71
571555717171
=5
5
71
5
71
571555717171