数学题一道,速度!化简求值题!若x= 一又1/2,(1-2x)²(2x+1)²-(3+2x)²(3-2x)²有过程.

问题描述:

数学题一道,速度!化简求值题!
若x= 一又1/2,(1-2x)²(2x+1)²-(3+2x)²(3-2x)²
有过程.

已知x=2/3
原式=(1-3)²(1+3)²-(3+3)²(3-3)²
=[(1-3)(1+3)]²-0
=[1-9]²
=(-8)²
=64

(1-2x)²(2x+1)²-(3+2x)²(3-2x)²
=[(2x)²-1²]²-[3²-(2x)²]²
=[(2x)²-1]²-[9-(2x)²]²
x= 一又1/2, (2x)²=9
原式=(9-1)²-(9-9)²=64-0=64

(1-2x)²(2x+1)²-(3+2x)²(3-2x)²=[(1-2x)(1+2x)]²-[(3+2x)(3-2x)]²=(1-4x²)²-(9-4x²)²=(1-4x²+9-4x²)(1-4x²-9+4x²)=(10-8x²)(-8...