5x(3x-2)-(x+1)

问题描述:

5x(3x-2)-(x+1)


=15x²-10x-x-1
=15x²-11x-1

=15x-10-x-1
=14x-11
①是5x(3x-2)-(x-1)
②是5乘(3x-2)-(x-1)
你自己选吧