问题
计算题
把下列各式分解因式:
(1)2x2﹣8xy+8y2
(2)4x3﹣4x2y﹣(x﹣y)
答案
解:(1)2x2﹣8xy+8y2=2(x2﹣4xy+4y2 )=2(x﹣2y)2;
(2)4x3﹣4x2y﹣(x﹣y)=4x2(x﹣y)﹣(x﹣y)=(x﹣y)(4x2﹣1)=(x﹣y)(2x+1)(2x﹣1).
把下列各式分解因式:
(1)2x2﹣8xy+8y2
(2)4x3﹣4x2y﹣(x﹣y)
解:(1)2x2﹣8xy+8y2=2(x2﹣4xy+4y2 )=2(x﹣2y)2;
(2)4x3﹣4x2y﹣(x﹣y)=4x2(x﹣y)﹣(x﹣y)=(x﹣y)(4x2﹣1)=(x﹣y)(2x+1)(2x﹣1).