Thực hiện phép tính:
(20.24+12.24- 48.22):82
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`(20.2^4+12.2^4-48.2^2):8^2`
`=(32.2^4-12.2^4):8^2`
`=[2^4.(32-12)]:8^2`
`=20.2^4:8^2`
`=20.16:64`
`=5`
Ta có: \(\left(20\cdot2^4+12\cdot2^4-48\cdot2^2\right):8^2\)
\(=\left(32\cdot2^4-12\cdot2^4\right):2^6\)
\(=20\cdot\dfrac{2^4}{2^6}\)
=5
\(=\left(5\cdot2^6+11\cdot2^4-23\cdot2^4\right):2^6=5+11\cdot\dfrac{1}{2^2}-23\cdot\dfrac{1}{2^2}=5+\dfrac{11}{4}-\dfrac{23}{4}=2\)
16 + (-17) + ........ + 82 + (-83) + 84 = -1 x 34 + 84
= -34 + 84 = 50
=(16-17)+(18-19)+...+(82-83)+84
=-1+(-1)+...+(-1)+84=(-1)*34+84=-34+84=50
a) \(2317+346-317+54\)
\(=\left(2317-317\right)+\left(346+54\right)\)
\(=2000+400\)
\(=2400\)
b) \(938+172-38-72\)
\(=\left(938-38\right)+\left(172-72\right)\)
\(=900+100\)
\(=1000\)
c) \(763-27-73\)
\(=763-100\)
\(=663\)
d) \(382+181-82+119\)
\(=\left(382-82\right)+\left(181+119\right)\)
\(=300+300\)
\(=600\)
5871:[928-(247-82.5)]
=5871:[928-(247-410)]
=5871:[928-(-163)]
=5871:(928+163)
=5871:1091
=5.381301558
=
a) 52 . 36 + 64 . 52
= 52 . ( 34 + 64 )
= 25 . 100
= 2500
b) 255 - 5. [ 82 - ( 32.4 + 9 )]
= 255 - 5 . [ 82 - ( 9 . 4 + 9 )]
= 255 - 5 . [ 82 - ( 36 + 9 )]
= 255 - 5 . [ 82 - 45 ]
= 255 - 5 . 37
= 255 - 185
= 70
a) 52. 36 + 64 . 52
= 25 . 36 + 64 . 25
= 25 . ( 36 + 64 )
= 25 . 100
= 2500
b) 255 - 5 . [ 82 − ( 32 . 4 + 9 ) ]
= 255 - 5 . [ 82 − ( 9 . 4 + 9 ) ]
= 255 - 5 . [ 82 − ( 36 + 9 ) ]
= 255 - 5 . [ 82 − 45 ]
= 255 - 5 . 37
= 255 - 185
= 70.
(20 . 2^4 + 12 . 2^4 - 48 . 2^2) : 8^2
= (20 . 16 + 12 . 16 - 48 . 4) : 64
= (16 . (20 + 12) - 48 . 4) : 64
= (16 . 32 - 48 . 4) : 64
= (512 - 192) : 64
= 320 : 64
= 5