问题 填空题
(
191919
989898
+
190190
980980
+
19001900
98009800
19
98
×
9898
1919
=______.
答案

(

191919
989898
+
190190
980980
+
19001900
98009800
19
98
×
9898
1919

=(

19×10101
98×10101
+
190×1001
980×1001
+
1900×10001
9800×10001
19
98
×
98×101
19×101

=(

19
98
+
19
98
+
19
98
98
19
×
98
19

=3×

19
98
×
98
19
×
98
19

=

294
19

=15

9
19

故答案为:15

9
19

单项选择题 A1/A2型题
单项选择题 A3/A4型题