=5X²-3X²+6X-8X+5
=2X²-2X+5
=a³b+a³b-2c-2a³b+2c
=0
=-6x²+3xy+4x²-4xy-24
=-2x²-xy-24
=2a²-18b-15a²-12b-3b
=-13a²-33b
2(a²b+ab²)-2(a²b-1)-2ab²-2 其中a=-2,b=2
=2(a²b+ab²)-2(a²b-1)-2(ab²+1)
=2a²b-a²b+1-ab²-1
=0
=5X²-3X²+6X-8X+5
=2X²-2X+5
=a³b+a³b-2c-2a³b+2c
=0
=-6x²+3xy+4x²-4xy-24
=-2x²-xy-24
=2a²-18b-15a²-12b-3b
=-13a²-33b
2(a²b+ab²)-2(a²b-1)-2ab²-2 其中a=-2,b=2
=2(a²b+ab²)-2(a²b-1)-2(ab²+1)
=2a²b-a²b+1-ab²-1
=0