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28 x 47 + 28 x 43 + 72 x 29 + 72 x 61
= 28 x ( 47 + 43 ) + 72 x ( 29 + 61)
= 28 x 90 + 72 x 90
= 90 x ( 28 + 72)
= 90 x 100
= 9 000
k mk nha
28 x 47 + 28 x 43 + 72 x 29 + 72 x 61
= 28 x (47 + 43) + 72 x (29 + 61)
= 28 x 90 + 72 x 90
= (28 + 72) x 90
= 100 x 90 = 9000
1: Ta có: \(2155-\left(174+2155\right)+\left(-68+174\right)\)
\(=2155-174-2155-68+174\)
=-68
2) Ta có: \(-25\cdot72+25\cdot21-49\cdot25\)
\(=-25\cdot\left(72-21+49\right)\)
\(=-25\cdot100=-2500\)
a, [ 13-17 ].[-10]+[-7]0
=-4.[-10]+1
=40+1
=41
b, 72.[28-49] + 28.[-49-72]
=72.[-21]+28.[-121]
=-1512+[-3388]
=-4900
c, -65.[87-17] - 87.[17-65]
=-65.70-87.[-48]
=4550-[-4276]
=8726
d, -23.63+23.21-58.23
=23.(-63)+23.21-58.23
=23.(-63+23-58)
=23.(-40-58)
=23.(-98)
=-2254
e, 25.134+25.[-34]
=25.[134+(-34)]
=25.100
=2500
= 72 . 28 -72. 49 + 28. (-49)-28.72
= 72.28 - 28 . 72 - 72 . 49 + 28 . (-49)
= 0 - 72 . 49 + 28 . ( -49 )
= -72 .49 + 28 . ( -49)
= 72 . ( -49) + 28 . (-49)
= (72+28) .(-49)
= 100 . (-49)
= -4900
k mình nha !
A)
-65.(87-17)-87.(17-65)
=-65.87-(-65).17-87.17-87.(-65)
=-(-65).17-87.17
=65.17-87.17
=17.(65-87)
=17.(-22)
=-374
B)
72.(28-49)+28.(-49-72)
= 72.28-72.49+28.(-49)-28.72
= -72.49+28.(-49)
= 72.(-49)+28.(-49)
= (-49).(72+28)
= -49.100
=-4900
C)
18-(-27)+63-(63+27)
= 18+27+63-63-27
= 45+0-27
= 45+(-27)
=45-27
=18
KICK MÌNH NHÁ
45-58+(-45)+(+58)-3=45-58-45+58-3=(45-45)+(58-58)-3=-3
(-57)-(-12)+3-(-57)=-57+12+3+57=(-57+57)+12+3=15
-(-24)-(-30)+(-24)-30+8=24+30-24-30+8=(24-24)+(30-30)+8=8
-(-12)+(+19)-(+12)+8-19=12+19-12+8-19=(12-12)+(19-19)+8=8
47-(-53)+(-47)-(+53)=47+53-47-53=(47-47)+(53-53)=0
-(+28)+32-(-28)+(-34)=-28+32+28-34=(-28+28)-(34-32)=-2
15-(+72)+(-15)+(+72)=15-72-15+72=(15-15)+(72-72)=0
20-(+46)+(-25)-(-46)=20-46-25+46=(20-25)+(46-46)=-5
28-(-32)+(-28)-32+5=28+32-28-32+5=(28-28)+(32-32)+5=5
-75+(-49)+(+75)+49-12=-75-49+75+49-12=(-75+75)+(49-49)-12=-12
\(...=45-58-45+58-3=-3\)
\(...=-57+12+3+57=15\)
\(...=24+30-24-30+8=8\)
\(...=12+19-12+8-19=8\)
\(...=47+53-47-53=0\)
\(...=-28+32+28-34=-2\)
\(...=15-72-15+72=0\)
\(...=20-46-25+46=-5\)
\(=...28+32-28-32+5=5\)
\(...=-75-49+75+49-12=-12\)
a ) - 24 + 13 + 6 +24
= [(-24) + 24 ] + 13 + 6
= 0 + 13 + 6
= 19
b) 28 + (-6) - 50 + 6
= 22 - 56
= - 34
c) - 27 + ( -789 ) + ( -73 ) +789
= [ (-789) + 789 ] + [ ( - 27 ) + ( -73) ]
= 0 + (-100)
= -100
d) (-23) + ( - 17 ) + 50 +(-10)
= [ ( -23 ) + ( -17 ) + ( -10) ] + 50
= ( -50 ) + 50
= 0
e) 1998+ (-72) + ( -1998 ) + 72
= [ 1998 + ( -1998 ) ] + [ (-72) + 72 ]
= 0 + 0
= 0
`72.28+28.13+85.72`
`=28.(72+13)+85.72`
`=28.85+85.72`
`=85.(28+72)`
`=85.100=8500`
=28.(72+13)+72.85
=28.85+72.85
=85(28+72)
=85.100
=8500