tính hợp lí
(-48) + 10 + (- 22)
( -12 )+ (-30 )+(-8)
(-12)+ 8+ (-58) +2
nhanh giúp e ạ
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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) 100 + (+430) + 2145 + (-530)
= 100 + [ (+430) + (-530) ] + 2145
= 100 + (-100) +2145
= 0 + 2145 = 2145
b) (-12) . 15 . 8 . (-4)
= [ (-12) . 8 ] . [ 15. (-4)]
= (-96) . (-60) = 5760
c) (+12) . 13 + 13 . (-22)
= 13. [ (+12) + (-22) ]
= 13. (-10) = -130
d) { [14 : (-2)] + 7 } : 2012
= { [ (-7) + 7 } : 2012
= 0 : 2012 = 0
e) -23 . 63 + 23 . 21 - 58 . 23
= 23 . -63 + 23 . 21 - 58.23
= 23. ( -63 + 21 - 58 )
= 23 . -100 = -2300
Hok tốt !
a) 100 + (+430) + 2145 + (-530)
=100+[430+(-530)]+2145
=100+(-100)+2145
=0+2145
=2145
b) (-12) . 15 . 8 . (-4)
=(-12.8).[15.(-4)]
=-90.(-60)
=5760
c) (+12) . 13 + 13 . (-22)
=13.[12+(-22)]
=13.(-10)
=-130
d) { [14 : (-2)] + 7 } : 2012
={-7+7}:2012
=0:2012
=0
e) -23 . 63 + 23 . 21 - 58 . 23
=23.(-63)+23.21-58.23
=23.(-63+21-58)
=23.(-100)
=-2300
1) \(35.18-5.7.28=35.18-35.28=35\left(18-28\right)=-350\)
2) \(45-5\left(12+9\right)=45-60-45=-60\)
3) \(24\left(16-5\right)-16\left(24-5\right)=24.16-24.5-16.24+16.5=5\left(16-24\right)=5.8=40\)
4) \(29\left(19-13\right)-19\left(29-13\right)=29.19-29.13-19.29+19.13=13\left(19-29\right)=-130\)
5) \(31.\left(-18\right)+31.\left(-81\right)-31=-31.\left(18+81+1\right)=-3100\)
6) \(\left(-12\right).47+\left(-12\right).52+\left(-12\right)=\left(-12\right)\left(47+52+1\right)=-1200\)
7) \(13\left(23+22\right)-3\left(17+28\right)=13.45-3.45=45.\left(13-3\right)=450\)
8) \(-48+48.\left(-78\right)+48.\left(-21\right)=-48\left(1+78+21\right)=-4800\)
`(-48)+10+(-22)=-48+10-22=-(48+22)+10=-70+10=-60`
`(-12)+(-30)+(-8)=-12-30-8=-(12+8)-30=-20-30=-50`
`(-12)+8+(-58)+2=-12+8-58+2=-(12+58)+(8+2)=-70+10=-60`