∵x+x-x-y-y=54,x-x+y+y=46
∴x-2y=54,2y=46
把2y=46代入x-2y=54:
x=8,y=23
验证:8+8-8+23+23=54,
8-8+23+23=46
∵为因为,∴为所以,希望能被采纳,谢谢!