В каком случае преобразование выражения a-b c-d выполнено неверно. 1) a-b+c-d=a+c-b-d
2)a-b+c-d=a-d+c-b
3)a-b+c-d=-b+a-d+c
4)a-b+c-d=b-a-d+c
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