- = × - = ×
- = × -= ×
= = = =
已知:
请计算:
= - =
- = - =
根据上面的规律写出下面算式的得数。
1- - - - - - - =
① 1× =1- ←→
② 2× =2- ←→
③ 3× =3- ←→
④ 4× =4- ←→