Question

Tính nhanh

a) ( 2354 - 45 ) - 2354

b) ( -2009 ) - ( 234 - 2009 )

c) ( 16 + 23 ) + ( 153 - 16 - 23 )

d) ( 134 - 167 + 45 ) - ( 134 + 45 )

e) 215 + 43 + ( -215 ) + ( -25 )

f) ( -312 ) + ( -327 ) + ( -28 ) + 27

Answer 1

a)2354-45-2345=2354-2354-45=-45. b)-2009-243+2009=-2009+2009-234+-243. c)16+23+153-16-23=16-16+23-23+153=153.d)134-167+45-134-45=134-134+45-45-167=-167.e)215+43-215-25=215-215+43-25=18.f)-312-327-28+27-312-28-327+27=340-300=40

Answer 2

a, (2354-45)-2354

=2354-45-2354

=(2354-2354)-45

=0-45

=-45

Answer 3

a)2354-45-2345=2354-2354-45=-45. b)-2009-243+2009=-2009+2009-234+-243. c)16+23+153-16-23=16-16+23-23+153=153.d)134-167+45-134-45=134-134+45-45-167=-167.e)215+43-215-25=215-215+43-25=18.f)-312-327-28+27-312-28-327+27=340-300=40

Answer 4

a)2354-45-2345=2354-2354-45=-45. b)-2009-243+2009=-2009+2009-234+-243. c)16+23+153-16-23=16-16+23-23+153=153.d)134-167+45-134-45=134-134+45-45-167=-167.e)215+43-215-25=215-215+43-25=18.f)-312-327-28+27-312-28-327+27=340-300=40