多项式2x-3y+5z与-2x+4y-6z的差是

问题描述:

多项式2x-3y+5z与-2x+4y-6z的差是

4x-7y+11z

2x-3y+5z-(-2x+4y-6z)=4x+y+11z

2x-3y+5z-(-2x+4y-6z)
=2x+2x-3y-4y+5z+6z
=4x-7y+11z

2x-3y+5z-(-2x+4y-6z)
=2x-3y+5z+2x-4y+6z
=4x-7y+11z

(2x-3y+5z)-(-2x+4y-6z)
=2x-3y+5z+2x-4y+6z
=4x-7y+11z