Ответ:
1) (a-b)×(a+b-1)
2) (10m-9n)×(10m+9n-1)
Объяснение:
1) a²-b²-(a-b)= (a-b)×(a+b)-(a-b)=(a-b)×(a+b-1);
2) 100m²-10m+9n-81n²=(10m-9n)×(10m+9n)-(10m-9n)=(10m-9n)×(10m+9n-1).
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Ответ:
1) (a-b)×(a+b-1)
2) (10m-9n)×(10m+9n-1)
Объяснение:
1) a²-b²-(a-b)= (a-b)×(a+b)-(a-b)=(a-b)×(a+b-1);
2) 100m²-10m+9n-81n²=(10m-9n)×(10m+9n)-(10m-9n)=(10m-9n)×(10m+9n-1).