Раскройте скобки и упростите :
1) (x+y) - (y-z)-(z+2.9)
2) 9a+8)-(a+b)+(b-c)
3) (7-m)+(m+n)-(n-k)
4) (x-n)+(m-5)-(m-n)
1) (x+y) - (y-z)-(z+2.9)
2) 9a+8)-(a+b)+(b-c)
3) (7-m)+(m+n)-(n-k)
4) (x-n)+(m-5)-(m-n)
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Verified answer
1) (x+y) - (y-z)-(z+2.9)= x+y - y+z-z-2.9=x-2,92) 9a+8)-(a+b)+(b-c)=9a+8-a - b+b-c=8a+8-c
3) (7-m)+(m+n)-(n-k)=7-m+m+n-n+k=7+k
4) (x-n)+(m-5)-(m-n)= x-n+m-5-m+n=x-5