1.用平方差
=(1-1/2)(1+1/2)(1-1/3)(1+1/3)……(1-1/10)(1+1/10)
=(1/2)(3/2)(2/3)(4/3)……(9/10)(11/10)
=(1/2)(11/10)
=11/20
2.(5分之3)^15÷(-3分之5)^14
=(3/5)^15×1/(-5/3)^14
=(3/5)^15×(3/5)^14
=(3/5)^29
1.用平方差
=(1-1/2)(1+1/2)(1-1/3)(1+1/3)……(1-1/10)(1+1/10)
=(1/2)(3/2)(2/3)(4/3)……(9/10)(11/10)
=(1/2)(11/10)
=11/20
2.(5分之3)^15÷(-3分之5)^14
=(3/5)^15×1/(-5/3)^14
=(3/5)^15×(3/5)^14
=(3/5)^29