Question

Упростите выражения:
6d-(d+9)+(5d-1)
4·(2a-c)-5·(a+3c)
2·(5m+n)+5·(n-2m)
11n-(7n-1)-6n+8
x(y+z)-y(x+z)-z(x-y)

Answer 1

1) 6d-d+5d-9-1=10d-10 2)8a-5a-4c-15c=-13a-19c 3)10m-10m+2n+5n=7n 4)11n-7n-6n+1+8=-2n+9 5)xy-xy+zx-zx-zy+zy=0