搜搜做题作业网先化简再求值
来源：学生作业帮 编辑：搜搜做题作业网作业帮 分类：数学作业 时间：2024/05/02 03:45:10
先化简再求值
⑴原式=(2a 1)(2a 1-2) 3
=(2a 1)(2a-1) 3
=4a²-1 3
=4a² 2
=4*2 2
=10
⑵原式=(x 1)x x-(x 1)(x-1)
=(x 1)(x-x 1) x
=2x 1
=-1 1
=0
=(2a 1)(2a-1) 3
=4a²-1 3
=4a² 2
=4*2 2
=10
⑵原式=(x 1)x x-(x 1)(x-1)
=(x 1)(x-x 1) x
=2x 1
=-1 1
=0