\(a.35-17+1993-35-1993\\ =-17+\left(35-35\right)+\left(1993-1993\right)\\ =-17+0+0\\ =-17\\ b.-48725-\left(357-48725\right)+300\\ =-48725-357+48725+300\\ =\left(300-357\right)+\left(48725-48725\right)\\ =-57+0\\ =-57\\ c.3579-\left(49-5+3579\right)+49\\ =3579-49+5-3579+49\\ =5+\left(3579-3579\right)+\left(49-49\right)\\ =5+0+0\\ =5\)
a) \(35-17+1993-35-1993\)
\(=\left(35-35\right)+\left(1993-1993\right)-17\)
\(=-17\)
b) \(-48725-\left(357-48725\right)+300\)
\(=\left(-48725+48725\right)+\left(300-357\right)\)
\(=-57\)
c) \(3579-\left(49-5+3579\right)+49\)
\(=\left(3579-3579\right)+\left(49-49\right)+5\)
\(=5\)
Tính hợp lí:
a) 35-17+1993-35-1993
=(35-35)+(1993-1993)-17
=-17
b) -48725-(357-48725)+300
=-48725-357+48725+300
=-57
c) 3579-(49-5+3579)+49
=3579-49+5-3579+49
=5
