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9) -48725 - ( 357 - 48725 ) + 300
= - 48725 + ( - 357) + 48725 + 300
= [ ( - 48725 ) + 48725 ] + [ ( - 357) + 300]
= 0 + ( -57)
= - 57
10) 3579 - ( 49 - 5 + 3579 ) + 49
= 3579 + ( -49) + 5 + ( -3579) +49
= [ 3579 + ( -3579) ] + [ ( - 49) + 49] + 5
= 0 + 0 + 5
= 5
9) - 48275 - ( 357 - 48725 ) + 300
= -48275 - 357 + 48725 + 300
= ( - 48725 + 48725 ) + ( -357 + 300)
= -57
10) 3579- ( 49 - 5 + 3579 ) + 49
= 3579 - 49 + 5 - 3579 + 49
= ( 3579 - 3579) + (-49 + 49) + 5
= 0+0+5= 5
3579 - ( 49 - 5 + 3579 ) + 49
= 3579 - 49 + 5 - 3579 + 49
= ( 3579 - 3579 ) + ( 49 - 49 ) + 5
= 0 + 0 + 5
= 5
\(6-\left(5-5847\right)+5-5847\)
= \(6-\left[\left(5-5\right)+\left(5847-5847\right)\right]\)
= \(6-\left[0+0\right]\)
= \(6-0\)
= \(6\)
\(35-17+1993-35-1993\)
= \(\left[\left(35-35\right)-\left(1993-1993\right)\right]-17\)
= \(0-0-17\)
= \(0-17\)
= \(\left(-17\right)\)
Bài 1:
a) - | 12 - 14 | - | 98 - 15 + 2 | - 14
= - | - 2 | - | 85 | - 14
= -2 - 85 - 14
= -101
b) ( -24 ) - ( 12 - 19 ) - | 15 - 12 - 7 |
= ( -24 ) - ( - 7 ) - | -4 |
= ( -24 ) + 7 - 4
= -21
Bài 2:
a) 5 - ( 1997 - 2005 ) + 1997
= 5 - 1997 + 2005 + 1997
= ( 5 + 2005 ) + ( 1997 - 1997 )
= 2010 + 0
= 2010
b) 1579 - ( 53 + 1679 ) - ( -53 )
= 1579 - 53 - 1679 + 53
= ( 1579 - 1679 ) + ( 53 - 53 )
= ( -100 ) + 0
= -100
c) -48725 - ( 357 - 48725 ) + 300
= -48725 - 357 + 48725 + 300
= [( -48725 ) + 48725 ] + ( 357 - 300 )
= 0 + ( -57 )
= -57
d) 4567 + ( 1234 - 4567 ) - 4
= 4567 + 1234 - 4567 - 4
= ( 4567 - 4567 ) + ( 1234 - 4 )
= 0 + 1230
= 1230
a) \(-\left|12-14\right|-\left|98-15+2\right|-14\)
\(=-\left|2\right|-\left|85\right|-14\)
\(=\left(-2\right)-85-14\)
\(=\left(-2\right)-\left(85+14\right)\)
\(=\left(-2\right)-99\)
\(=\left(-2\right)+\left(-99\right)=-101\)
\(5-\left(1997-2005\right)+1997\)
\(=5-1997+2005+1997\)
\(=2010\)
\(1579-\left(53+1579\right)-\left(-53\right)\)
\(=1579-53-1579+53\)
\(=0\)
\(-48-\left(357-48\right)+300\)
\(=\)\(-48-357+48+300\)
\(=-57\)
\(173-\left(36+173\right)+\left(175-27\right)-175-\left(-36+50\right)\)
\(=173-36-173+175-27-175+36-50\)
\(=-27-50\)
\(=-77\)
\(\)
\(-\left[-171+171+23\right]-\left[172-\left(38+172\right)\right]-49\)
\(=171-171-23-172+38+172-49\)
\(=-23+38-49=-34\)
1) 2155 - (174 + 2155) + (-68 + 174)
= 2155 - 174 - 2155 - 68 + 174
= (2155 - 2155) + (-174 + 174) - 68
= 0 + 0 - 68
= -68
2) -25 . 72 + 25 . 21 - 49 . 25
= 25 . (-72) + 25 . 21 - 49 . 25
= 25 . (-72 + 21 - 25)
= 25 . (-76)
= -1900
3) 35 . (14 - 23) - 23 . (14 - 35)
= 35 . 14 - 35 . 23 - 23 . 14 + 23 . 35
= (35 . 14 - 23 . 14) + (-35 . 23 + 23 . 35)
= [14 . (35 - 23)] + 0
= 14 . 12
= 168
4) 8154 - (674 + 8154) + (-98 + 674)
= 8154 - 674 - 8154 - 98 + 674
= (8154 - 8154) + (-674 + 674) - 98
= 0 + 0 - 98
= -98
5) -25 . 21 + 25 . 72 + 49 . 25
= 25 . (-21) + 25 . 72 + 49 . 25
= 25 . (-21 + 72 + 49)
= 25 . 100
= 2500
6) 27 . (13 - 16) - 16 . (13 - 17)
= 27 . 13 - 27 . 16 - 16 . 13 + 16 . 17
= (27 . 13 - 16 . 13) + (-27 . 16 + 16 . 17)
= [13 . (27 - 16)] + [16 . (-27 + 17)]
= (13 . 11) + [16 . (-10)]
= 143 - 160
= -17
1) 2155-2155-(174-174)+-68=0+0+-68=-68
giờ mk ghi kq được ko
\(a.35-17+1993-35-1993\\ =-17+\left(35-35\right)+\left(1993-1993\right)\\ =-17+0+0\\ =-17\\ b.-48725-\left(357-48725\right)+300\\ =-48725-357+48725+300\\ =\left(300-357\right)+\left(48725-48725\right)\\ =-57+0\\ =-57\\ c.3579-\left(49-5+3579\right)+49\\ =3579-49+5-3579+49\\ =5+\left(3579-3579\right)+\left(49-49\right)\\ =5+0+0\\ =5\)
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) \(3579-\left(49-5+3579\right)+49\)
\(=\left(3579-3579\right)+\left(49-49\right)+5\)
\(=5\)