如果x^2m-1÷x^2=x^m+1
即
x^(2m-3)=x^m+1
2m-3=m+1
m=4
已知a^m=8,a^n=3,a^k=2,
a^m-3k+2n
=a^m÷(a^k)³×(a^n)²
=8÷2³×3²
=8÷8×9
=1×9
=9
所以
a^m-3k+2n的算术平方根=3
如果x^2m-1÷x^2=x^m+1
即
x^(2m-3)=x^m+1
2m-3=m+1
m=4
已知a^m=8,a^n=3,a^k=2,
a^m-3k+2n
=a^m÷(a^k)³×(a^n)²
=8÷2³×3²
=8÷8×9
=1×9
=9
所以
a^m-3k+2n的算术平方根=3