底数相同的两次方相乘,就是指数相加。所以当你分相同底数下的两种幂减去指数相加。换句话说,对于所有实数 一个 , b 和 c ,在那里 一个 ≠ 0 ,
一个 b 一个 c = 一个 B−c
你真正要做的是把公因数从分子和分母上消去。例子:
9 5 9 2 = 9 ⋅ 9 ⋅ 9 ⋅ 9 ⋅ 9 9 ⋅ 9 = 9 ⋅ 9 ⋅ 9 = 9 3.