(1又3分之2)的2008次方乘以(0.6)的2007次方
=(5/3)的2007次方乘以(3/5)的2007次方×(5/3)
=1×5/3
=5/3=(5/3)的2007次方乘以(3/5)的2007次方×(5/3)=1×5/3这里(5/3)2007次方乘以(3/5)2007次方就等于一吗?为什么啊?是的, 因为 (5/3)的2007次方乘以(3/5)的2007次方 =(5/3×3/5)的2007次方 =1的2007次方 =1再问你道题已知a+b=6,ab=2。求a²+b²求(a-b)²a²+b² =(a+b)²-2ab =36-4 =32 (a-b)² =(a+b)²-4ab =36-8 =28