初一的化简求值,但怕算不准.x-{-5x-[-y+(-x+3y)+x]},其中3x+y=1._数学解答

初一的化简求值,但怕算不准.
x-{-5x-[-y+(-x+3y)+x]},其中3x+y=1.

人气：323 ℃　时间：2020-04-23 14:09:13

解答

x-{-5x-[-y+(-x+3y)+x]},
=x-[-5x-(-y-x+3y+x)]
=x-(-5x-2y)
=x+5x+2y
=6x+2y
=2(3x+y)
=2*1
=2