问题 解答题
(
1
15
+
2
17
)×15×17
答案

(

1
15
+
2
17
)×15×17,

=(

1
15
+
2
17
)×(15×17),

=

1
15
×15×17+
2
17
×17×15,

=17+30,

=47.

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