10又3/4*9又1/4简便计算

问题描述:

10又3/4*9又1/4简便计算

三景子,你好:
10又3/4×9又1/4
=(10+3/4)×(10-3/4)
=10×10-3/4×3/4
=100-9/16
=99又7/16

=(10+3/4)*(10-3/4)
=10²-(3/4)²
=100-9/16
=99+7/16
=99又7/16