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a) -(12+21-23)-(23-21+10)
=-12-21+23-23+21-12=-12-12=-24
b)(57-725)-(605-53)
=57-725-605+53=-1220
c)(55+45+45)-(15-55+45)
=55+45+45-15+55-45=110+45-15=140
-(12+21-23)-(23-21+10)
=-12-21+23-23+21-10
=(21-21)+(23-23)-(12+10)
=0+0-22=-22
(57-725)-(605-53)
=57-725-605+53
=(57+53)-(725+605)
=110-1330
=-1220
(55+45+45)- (15-55+45)
=55+45+45-15+55-45
=(45+55)+(55-15)+(45-45)
=100+40+0=140
a, 214+[120-(214+120)]=214+[120-214-120]
=214+120-214-120
=(214-214)+(120-120)
=0+0
=0
b,(-321)-[(-321+35)-235]=-321-[-321+35-235]
=-321-321-35+235
= (-321-321)-(35+235)
=0+270
=270
1) 40 + 15 + (-10) + (-15) 2) -13 + (-750) + (-17) + 750 3) (35 - 17) + (17 + 120 - 35)
= 40 + 15 - 10 - 15 = -13 - 750 - 17 + 750 = 35 - 17 + 17 + 120 - 35
= (40 - 10) + (15 - 15) = (-13 - 17) + (-750 + 750) = (35 - 35) + (-17 + 17) + 120
= 30 = -30 = 120
4) (55 + 45 + 15) - (15 - 55 + 45) 5) -(12 + 21 - 23) - (23 - 21 + 10) 6) (2020 - 79 + 15) - (-79 + 15)
= 55 + 45 + 15 - 15 + 55 - 45 = -12 -21 + 23 - 23 + 21 - 10 = 2020 - 79 + 15 + 79 - 15
= (45 - 45) + (15 - 15) + (55 + 55) = (-12 - 10) + (-21 + 21) + (23 - 23) = 2020 + (-79 + 79) + (15 - 15)
= 110 = -22 = 2020
7) -(515 - 80 + 91) - (2010 + 80 - 91) 8) 25 - (-17) + 24 - 12 9) 235 - (34 + 135) - 100
= -515 + 80 - 91 - 2010 - 80 + 91 = 25 + 17 + 24 - 12 = 235 - 34 - 135 - 100
= (-515 -2010) + (80 - 80) + (-91 + 91) = 54 = -34
= -2525
10) (13 + 49) - (13 - 135 + 49)
= 13 + 49 - 13 + 135 - 49
= (13 - 13) + (49 - 49) +135
= 135
a) (65+27-49) - ( 45+37-19)
= 65+27-49 - 45 -37+19
= (65-45)+ ( 27-37) + (-49+19)
= 20 + (-10) + (-30)
= -20
57-725-605+53=-1220
55+45+15-15+55-45=110
Ủng hộ mk nhaaa
( 45 + 120 ) + ( 2012 - 120 - 45 )
= 45 + 120 + 2012 - 120 - 45
= ( 45 - 45 ) + ( 120 - 120 ) + 2012
= 0 + 0 + 2012
= 2012
(45 + 120) + (2012 - 120 - 45)
= 45 + 120 + 2012 - 120 - 45
= (45 - 45) + (120 - 120) + 2012
= 0 + 0 + 2012
= 2012