> 数学 >
5
21
×
2
7
+2
19
21
×
5
7
+(1−
2
7
)
人气:204 ℃ 时间:2020-04-23 07:11:40
解答
5
21
×
2
7
+2
19
21
×
5
7
+(1-
2
7
),
=
5
21
×
2
7
+2
19
21
×
5
7
+
5
7

=
5
21
×
2
7
+(2
19
21
+1)×
5
7

=
5
21
×
2
7
+
82
21
×
5
7

=
2
21
×
5
7
+
82
21
×
5
7

=(
2
21
+
82
21
)×
5
7

=4×
5
7

=
20
7
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