ok men
a, (2354 - 45) - 2354
= 2354 - 45 - 2354 = ( 2354 - 2354 ) - 45 = 0 - 45 = -45
b, (-2009 ) - ( 234 - 2009 )
= (-2009 ) - 234 + 2009 = ( -2009 + 2009 ) -234 = 0- 234 = -234
c, ( 16 + 23 ) + ( 153 - 16 - 23 )
= 16 + 23 + 153 - 16 - 23 = ( 16 - 16 ) + ( 23 - 23 ) + 153 = 0 + ) + 153 = 153
d, (134- 167 + 45 ) - ( 134 + 45 )
= 134 - 167 + 45 - 134 - 45
= ( 134 - 134 ) + ( 45 - 45 ) - 167 = 0 - 0 - 167 = -167
e, 215 + 43 - 215 - 25
= ( 215 - 215 ) + ( 43 - 25 ) = 0 + 18 = 18
f, (-312)- 327 - 28+ 27
= ( -312 - 327 ) - ( 28 - 27 )
= -639 - 1
= -640
a) (2354-45)-2354=2354-45-2354=-45
b) (-2009)-(234-2009)=-2009-234+2009=-234
c) (16+23)+(153-16-23)=16+23+153-16-23=153
d) (134-167+45)-(134+45)=134-167+45-134-45=-167
e) 215+43+(-215)+(-25)=215+43-215-25=18
f) (-312)+(-327)+(-28)+27=-312-327-28+27=-640
ok chưa bạn nếu ok rồi thì cho mik 1 like nha
Tính nhanh
a) ( 2354 - 45 ) - 2354
= 2354 - 45 - 2354
= 2354 - 2354 - 45
= 0 - 45
= -45
b) ( -2009 ) - ( 234 - 2009 )
= ( -2009 ) - 234 + 2009
= ( -2009 ) - 2009 - 234
= 0 - 234
= -234
c) ( 16 + 23 ) + ( 153 - 16 - 23 )
= 16 + 23 + 153 - 16 - 23
= (16 - 16) + (23 - 23) + 153
= 0 + 0 + 153
= 153
d) ( 134 - 167 + 45 ) - ( 134 + 45 )= 134 - 167 + 45 - 134 - 45
= (134 - 134) + (45 - 45) - 167
= 0 + 0 - 167
= -167
e) 215 + 43 + ( -215 ) + ( -25 )
= [215 + ( -215 )] + [( -25 ) + 43]
= 0 + 18
= 18
f) ( -312 ) + ( -327 ) + ( -28 ) + 27
= - 312 - 327 - 28 + 27
= (- 327 + 27) - 312 - 28
= -300 - 340
= -640
