1.16的2m次方÷8的2m次方÷4的m次方=?2.[3(a+b)的平方-2(a+b)]÷(a+b)=?
问题描述:
1.16的2m次方÷8的2m次方÷4的m次方=?2.[3(a+b)的平方-2(a+b)]÷(a+b)=?
3.[(x+y)的3次方-2(x+y)的平方-4(x+y)]÷(x+y)
答
1.16的2m次方÷8的2m次方÷4的m次方
=(2^4)^(2m)÷(2^3)^(2m)÷(2^2)^m
=2^(8m)÷2^(6m)÷2^(2m)
=1
2.[3(a+b)²-2(a+b)]÷(a+b)
=3a+3b-2
3.[(x+y)³-2(x+y)²-4(x+y)]÷(x+y)
=(x+y)²-2(x+y)-4