如何求解分数指数。
提高到n / m的幂的基数b等于:
b N / M =(米√ b)ñ =米√(B Ñ)
例:
升至3/2的幂的基数2等于1除以3的幂的基数2:
2 3/2 = 2 √(2 3)= 2.828
带指数的分数:
(a / b)n = a n / b n
例:
(4/3)3 = 4 3 /3 3 =27分之64= 2.37
升高到负n / m的幂的基数b等于1除以升高到n / m的幂的基数b:
b -n /米= 1 / b N / M = 1 / (米√ b)ñ
例:
升高到负1/2的幂的基数2等于1除以升高到1/2的幂的基数2:
2 -1/2 = 1/2 1/2 = 1 / √ 2 = 0.7071
升高到负n的幂的基数a / b等于1除以升高到n的幂的基数a / b:
(一/ b)- ñ = 1 /(一个/ b)ñ = 1 /(一个ñ / b Ñ)= b ñ /一个Ñ
例:
底数2乘以3的幂等于1除以底数2乘以3的幂:
(2/3)-2 = 1 /(2/3)2 = 1 /(2 2 /3 2)= 3 2 /2 2 = 9/4 = 2.25
将分数指数与相同的分数指数相乘:
一N / M ⋅ b N / M =(一个⋅ b)N / M
例:
2 3/2 ⋅3 3/2 =(2⋅3)3/2 = 6 3/2 = √(6 3)= √ 216 = 14.7
用相同的底数乘以分数指数:
一N / M ⋅一个ķ/ J =一个( N / M)+(K / J)
例:
2 3/ 2⋅2 4/3 = 2 (3/2)+(4/3) = 7.127
用不同的指数和分数乘以分数指数:
一N / M ⋅ b K /Ĵ
例:
2 3/2 ⋅3 4/3 = √(2 3)⋅ 3 √(3 4)= 2.828⋅4.327 = 12.237
将分数乘以相同的分数底数的分数:
(A / B)ñ ⋅(A / b)米=(A / B)n + m个
例:
(4/3)3 ⋅(4/3)2 =(4/3)3 + 2 =(4/3)5 = 4 5 /3 5 = 4.214
将分数与相同指数的分数相乘:
(A / B)ñ ⋅(C / d)ñ =((A / B)⋅(C / d))ñ
例:
(4/3)3 ⋅(3/5)3 =((4/3)⋅(3/5))3 =(4/5)3 = 0.8 3 =0.8⋅0.8⋅0.8= 0.512
将具有不同基数和指数的指数乘以分数:
(A / B)ñ ⋅(C / d)米
例:
(4/3)3 ⋅(1/2)2 = 2.37 / 0.25 = 9.481
用相同的分数指数除以分数指数:
a n / m / b n / m =(a / b)n / m
例:
3 3/2 / 2 3/2 =(3/2)3/2 = 1.5 3/2 = √(1.5 3)= √ 3.375 = 1.837
除以相同基数的分数指数:
a n / m / a k / j = a ( n / m)-(k / j)
例:
2 3/2 / 2 4/3 = 2 (3/2)-(4/3) = 2 (1/6) = 6 √ 2 = 1.122
用不同的指数和分数划分分数指数:
a n / m / b k / j
例:
2 3/2 / 3 4/3 = √(2 3)/ 3 √(3 4)= 2.828 / 4.327 = 0.654
用分数相同的分数基除分数:
(a / b)n /(a / b)m =(a / b)nm
例:
(4/3)3 /(4/3)2 =(4/3)3-2 =(4/3)1 = 4/3 = 1.333
用相同指数的指数除以分数:
(a / b)n /(c / d)n =((a / b)/(c / d))n =(((a⋅d/b⋅c))n
例:
(4/3)3 /(3/5)3 =((4/3)/(3/5))3 =(((4⋅5)/(3⋅3))3 =(20/9)3 = 10.97
用具有不同基数和指数的指数划分分数:
(a / b)n /(c / d)米
例:
(4/3)3 /(1/2)2 = 2.37 / 0.25 = 9.481
通过首先提高每个指数,然后添加以下内容来完成分数的加法运算:
a n / m + b k / j
例:
3 3/2 + 2 5/2 =√(3 3)+√(2 5)=√(27)+√(32)= 5.196 + 5.657 = 10.853
添加相同的底数b和指数n / m:
b n / m + b n / m = 2 b n / m
例:
4 2/3 + 4 2/3 =2⋅4 2/3 = 2⋅ 3 √(4 2)= 5.04
减去分数指数的方法是先提高每个指数,然后减去:
a n / m - b k / j
例:
3 3/2 - 2 5/2 =√(3 3) - √(2 5)=√(27) - √(32)= 5.196 - 5.657 = -0.488
减去相同的底数b和指数n / m:
3 b n / m - b n / m = 2 b n / m
例:
3⋅4 2/3 - 4 2/3 =2⋅4 2/3 = 2⋅ 3 √(4 2)= 5.04