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a)
Ta có: A = 1 – 2 – 3 + 4 + 5 – 6 – 7 + 8 + … + 2015 – 2016 – 2017 + 2018
A = (1 – 2 – 3 + 4) +( 5 – 6 – 7 + 8) + … + (2015 – 2016 – 2017 + 2018)
A = 0 + 0 + … + 0 = 0.
b)
16.50.(-25).(-250)
= (2.50).[(-25).(-4)]
= [(-125).(-8)].(2.5)
= 4.4.50.(-25).(-250)
= [4.(-25)].[4.(-250)].50
= [(-100).(-1000)].50
= 100000 .50
= 5000000
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(-1)3.[(-10)3-(-42)] = 984
-----------------------------------
5000000 + 984 = 5000984
a) 2.(-25).(-4).50 = 10000
b) 16.50.(-25).(-250) = 5000000
c)
− 167 . − 83 + 167.17 − 33 = 167.83 + 167.17 − 33 = 167. 83 + 17 − 33 = 167.100 − 33 = 1667
d)
135 − 35 .47 − 53. − 48 − 52 = 100.47 − 53. − 100 = 100.47 + 53.100 = 100. 47 + 53 = 100.100 = 10000
a) 2. − 25 . − 4 .50 = 10000
b) 16.50. − 25 . − 250 = 5000000
c)
− 167 . − 83 + 167.17 − 33 = 167.83 + 167.17 − 33 = 167. 83 + 17 − 33 = 167.100 − 33 = 1667
d)
135 − 35 .47 − 53. − 48 − 52 = 100.47 − 53. − 100 = 100.47 + 53.100 = 100. 47 + 53 = 100.100 = 10000
a, ( -4 ).125.( -25 ).( -8 ).( -6 )
= [ ( -4 ).( -25 ) ].[ 125.( -8 ) ].( -6 )
= 100.( -1000 ).( -6 )
= ( -100 000).( -6 )
= 600 000
b, ( -2 ).12.( -50 )
= [ ( -2 ).( -50 ) ].12
= 100.12 = 1200
c, ( -25 ).( - 26 ).( - 4 )
= [ ( -25 ).( -4 ) ].( - 26 )
= 100.( -26 ) = -2600
a) (-4) . 125 . (-25) . (-8) . (-6)
= (-4). (-25) . 125 . (-8) - (-6)
= 100 . (-1000) . (-6)
= -100000 . (-6)
=600000
Bài 1
a, 32.(-64) - 64. 68
= -64.(32 + 68)
= -64 .100
= - 6400
b, -54.76 + 12.(-76) - 76.34
= -76.(54 + 12 + 34)
= -76.100
= -7600
19- 42.(-19) + 38.5
= 19 + 42.19 + 19.2.5
= 19.(1 + 42 + 10)
= 19.53
= 1007
-125.5.(-4).(-8).(-25)
=[(-125).(-8)].[(-25).(-4)].5
=1000.100.5
=500000
Ta có :
a, \(25.4.100.8\)
\(=\left(25.4\right).100.8\)
\(=100.100.8\)
\(=80000\)
b, \(50.0,1.5^2\)
\(=5.1.5^2\)
\(=5^3\)
\(=125\)
a ) \(25.4.100.8=\left(25.4\right).100.8\)
\(=100.100.8\)
\(=80000\)
b ) \(50.0,1.5^2=5.1.5^2\)
\(=5^3=125\)
a) 2.(-25).(-4).50 b) -125.5.(-8).2 c) 16.50.(-25).(-250)
= (2.50).[(-25).(-4)] = [(-125).(-8)].(2.5) = 4.4.50.(-25).(-250)
= 100 . 100 = 1000 . 10 = [4.(-25)].[4.(-250)].50
= 10000 = 10000 = [(-100).(-1000)].50
= 100000 .50
= 5000000
a) 2.(-25).(-4).50=(2.50).[(-25).(-4)]=100.100=10000
b)-125.5.(-8).2=[(-125).(-8)].(2.5)=1000.10=10000
c)16.50.(-25).(-250)=4.4.50.(-25).(-250)=[4.(-25)].[4.(-250)].50=(-100).(-1000).50=100000.50=5000000