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a, ( -2009 ) - ( 234 - 2009 )
b, ( 134 - 167 + 45 ) - ( 134 + 45 )
c, 321 + { -15 + [ 30 + ( -321 ) ]}
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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
a, (2354-45)-2354
=2354-45-2354
=(2354-2354)-45
=0-45
=-45
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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
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45 . (-24) +( -10) . (-12)
=45 .2 .(-12) +(-10) . (-12)
= -12(45 . 2 +(-10) )
= -12. 80
= -960
nếu chỗ 51 . 134 là 51 . (-134) thì mk làm đc
(-134) + 51 . (-134) + (-134) . 8
= -134( 1+51+8)
= -134 . 60
= -8040
k cho mk nha
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1: =20*(-4)+24(-30)
=-80-720=-800
2: =-13*57+13*32+57*13-57*45
=13*32-57*45=-2149
3: =-12*8*125
=-12*1000=-12000
4: =(-134)(1-51+48)
=(-134)*(-2)=268
5: =(-24)(45-5)=40*(-24)=-960
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a: =-45*24+120
=-1080+120
=-960
b: =134(-1+51-48)
=134*2
=268
c: =-41*59-41*2+59*41-59*2
=-2(41+59)
=-200
![](https://rs.olm.vn/images/avt/0.png?1311)
=134-167+45-134-45
=-167