9/16×9-7/16×7
问题描述：
9/16×9-7/16×7
答
9/16×9-7/16×7
=（9×9-7×7）/16
=（81-49）/16
=32/16
=2
答
9/16 x 9 - 7/16 x 7
=(9 x 9 - 7 x 7)/16
=(9+7)(9-7)/16
=(16 x 2)/16
=2
答
9/16×9 - 7/16×7
= 1/16×（81 - 49）
= 1/16 × 32
= 2