> 数学 >
2
1
17
×15-(5
21
23
+5
15
17
人气:225 ℃ 时间:2020-01-24 20:16:43
解答
2
1
17
×15-(5
21
23
+5
15
17
),
=30
15
17
-5
21
23
-5
15
17

=(30
15
17
-5
15
17
)-5
21
23

=25-5
21
23

=19
2
23
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