Раскройте скобки.
1. (x+y-z)-1
2. x+(y-x)
3. (x+y)-(x-y)
4. (x-y+z)-(x+y-z)
1. (x+y-z)-1
2. x+(y-x)
3. (x+y)-(x-y)
4. (x-y+z)-(x+y-z)
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Answers & Comments
2. x+(y-x)=x+y-x=y
3. (x+y)-(x-y)=x+y-x+y=2y
4. (x-y+z)-(x+y-z)=x-y+z-x-y+z=2z-2y