1. (7х² - 5х+3) -( 7х² - 5)= 2. (3х+1)+(-3х² - 3х+1)=
3. (а+3b)+(3a-3b)=
4. a²-5ab-b²-(a²+b²)=
5. (x+y-z)- (x-y)+( x-y+z)=
Решите срочно пожалуйста, подробно прошу)))
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