Ответ:
Объяснение:
(x-3y)-(3y-x)=(x-3y)+(x-3y)=(x-3y)(1+1)=2×(x-3y);
3y-x=- (x-3y)
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Ответ:
Объяснение:
(x-3y)-(3y-x)=(x-3y)+(x-3y)=(x-3y)(1+1)=2×(x-3y);
3y-x=- (x-3y)