> 数学 >
51
2
3
×
3
5
+71
3
4
×
4
7
+91
4
5
×
5
9
人气:198 ℃ 时间:2019-10-30 21:31:03
解答
51
2
3
×
3
5
+71
3
4
×
4
7
+91
4
5
×
5
9

=(50+
5
3
)×
3
5
+(70+
7
4
)×
4
7
+(90+
9
5
)×
5
9

=50×
3
5
+
5
3
×
3
5
+70×
4
7
+
7
4
×
4
7
+90×
5
9
+
9
5
×
5
9

=31+41+51,
=123;
故答案为:123.
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