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а) b²-c²-b+c=

б) a+b-a²+b²=

в) a²-a-c²+c=

г) m-m²-n+n²=

1) (b - c) (b + c) - (b - c) = (b - c) (b + c - 1)

2) (b + a) + (b - a) (b + a) = (a + b) (1 - a + b)

3) (a - c) (a + c) - (a - c) = (a - c) (a + c - 1)

4) (n - m) (n + m) + (m - n) = (n - m) (n + m) - (n - m) = (n - m) (n + m - 1)

1. (b-c) (b+c) - b+c = (b+c) (b-c + 1)

2. a+b + (b-a) (b+a) = (a+b) (1+b-a)

3. (a-c) (a+c) - (a-c) = (a-c) (a+c-1)

4. m-n + (n-m) (n+m) = m-n - (m-n) (n+m) = (m-n) (1-n-m)