问题
填空题
化简:
|
答案
121×0.81
=
×121 0.81
=11×0.9=9.9;
52+122
=25+144
=169
=13;
412-402
=(41+40)×(41-40)
=81
=9.
故答案为:9.9;13;9.
化简:
|
121×0.81
=
×121 0.81
=11×0.9=9.9;
52+122
=25+144
=169
=13;
412-402
=(41+40)×(41-40)
=81
=9.
故答案为:9.9;13;9.