1.Если а-b=0,то
1) a=b. 2)a>b. 3) a≤b. 4)a=b

2.Если a-b=0, то
1)a≤b. 2) a a. 4) -b<-a

3. Если -7,5а>-6,5а, то
1) а=0. 2) а>0. 3) а<0. 4) а≥0
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