8/25×9/16+9/25×7/16
问题描述：
8/25×9/16+9/25×7/16
答
=(8*9+9*7)/(25*16)
=9*15/(25*16)
=9*3/5*16
=27/80
答
8/25×9/16+9/25×7/16
=8/25×9/16+7/25×9/16
=(8/25+7/25)×9/16
=15/25*9/16
=27/64
答
8/25×9/16+9/25×7/16
=9/25×8/16+9/25×7/16
=9/25(8/16+7/16)
=9/25x15/16
=27/80