去括号:x+(-y+3) x-(-3-y)去括号:x+(-y+3)x-(-3-y) -(x-y)+33-(x+y)

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去括号:x+(-y+3) x-(-3-y)去括号:x+(-y+3)x-(-3-y) -(x-y)+33-(x+y)

去括号:x+(-y+3) x-(-3-y)去括号:x+(-y+3)x-(-3-y) -(x-y)+33-(x+y)
去括号:x+(-y+3) x-(-3-y)
去括号:x+(-y+3)
x-(-3-y)
-(x-y)+3
3-(x+y)

去括号:x+(-y+3) x-(-3-y)去括号:x+(-y+3)x-(-3-y) -(x-y)+33-(x+y)

楼主你好