（4a²-3b²）-[2(a²-1）+2b²-3]

来源：学生作业学帮网编辑：学帮网时间：2024/06/25 02:15:52

（4a²-3b²）-[2(a²-1）+2b²-3]
=4a²-3b²-(2a²-2+2b²-3)
=4a²-3b²-(2a²+2b²-5)
=4a²-3b²-2a²-2b²+5
=(4a²-2a²)+(-3b²-2b²)+5
=2a²-5b²+5

（4a²-3b²）-[2(a²-1）+2b²-3]
=4a²-3b²-2(a²-1）-2b²+3
=4a²-3b²-2a²+2-2b²+3
=2a²-5b²+5