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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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a) 1 3 + 3 8 + − 4 3 = 1 3 + − 4 3 + 3 8 = − 1 + 3 8 = − 5 8
b) − 2 15 + 12 13 + − 13 15 + − 1 13 = − 2 15 + − 13 15 + 12 13 + − 1 13 = − 1 + 11 13 = − 2 13
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e) 215 + 43 + ( -215 ) + ( -25 )
=[215+(-215)] + [43+ (-25) ]
=0+18=18
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a)126.(-43)+26.43=43(-126+26)=43(-100)=-4300
b)(-135)(-45)-35.45=-45(-135+35)=-45(-100)=4500
c)113(-27)+27.13=27(-113+13)=27(-100)=-2700
d)125(-35)-(-25).35=-35(125-25)=-35.100=-3500
\(a)126.\left(-43\right)+26.43\)
\(=\left(-126\right).43+26.43\)
\(=43\left(-126+26\right)\)
\(=43.\left(-100\right)\)
\(=-4300\)
\(b)\left(-135\right).\left(-45\right)-35.45\)
\(=135.45-35.45\)
\(=45\left(135-35\right)\)
\(=45.100\)
\(=4500\)
\(c)113.\left(-27\right)+27.13\)
\(=\left(-113\right).27+27.13\)
\(=27\left(-113+13\right)\)
\(=27.\left(-100\right)\)
\(=-2700\)
\(d)125.\left(-35\right)-\left(-25\right).35\)
\(=\left(-125\right).35-\left(-25\right).35\)
\(=35\left(-125+25\right)\)
\(=35.\left(-100\right)\)
\(=-3500\)
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a) ( 2993 + 215 ) - 1993
= ( 2993 - 1993 ) + 215
= 1000 + 215
= 1215.
b) 2043 - ( 1560 + 43 )
= 2043 - 43 + 1560
= 2000 + 1560
= 3560
c) 46 - ( 12 - 20 )
= 46 - 12 - 20
= 34 - 20
= 14
d) 27 + ( 19 - 36 )
= 27 + 19 - 36
= 46 - 36
= 10
đúng nha!
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7 x 17 x 125 = (8 x 125) x 17 = 1000 x 17 = 17000
4 x 37 x 25 = (25 x 4 ) x 7 = 100 x 7 = 700
43 x 27 + 93 x 43 + 57 x 81 + 69 x 57 = 43 x (27 + 93) + 57 x (81 +69) = 43 x 120 + 57 x 120 + 57x30 = 120 x (43 + 57) + 1710 = 12000 + 1710 = 13710
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A.( 13 + 25 ) + ( 24 - 13 - 42 - 25 )
= 13 + 25 + 24 - 13 - 42 - 25
= ( 13 - 13 ) + ( 25 - 25 ) + ( 24 - 42 )
= 0 + 0 + ( - 18 )
= -18
B. ( 215 - 34 + 127 ) - ( 315 - 144 - 227 )
= 215 - 34 + 127 - 315 + 144 + 227
= ( 215 - 315 ) + ( 144 - 34 ) + ( 127 + 227 )
= - 100 + 110 + 354
= 10 + 354
= 364
`45+43+(-215)+(-25)`
`=45+43-215-25`
`=(45-215-25)+43`
`=-195+43`
`=-152`
45 + 43 + ( -215 ) + ( -25 )
= = 88 - 215 - 25
= -152