化简:1.(2p-q)-(3q-p) 2.a-2(a-b) 3.(x-1)-2(1-x)+(x+1)

问题描述:

化简:1.(2p-q)-(3q-p) 2.a-2(a-b) 3.(x-1)-2(1-x)+(x+1)

1.(2p-q)-(3q-p)
=2p-q-3q+p
=3p-4q
2.a-2(a-b)
=a-2a+2b
=2b-a
3.(x-1)-2(1-x)+(x+1)
=x-1-2+2x+x+1
=4x-2