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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) 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
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,=(-30+10)+(-15+15)
=-20+0
=-20
b, (-12+25)+(-17+17)
=13+0
=13
c,[(-14)+(-16)]+(-250+250)
=-30+0
=-30
d,-17+(-10)+27
=-27+27
=0
= ( -25) . ( -2) . ( -34) + ( -34) . ( -250)
= 50 . (-34) + ( -34) . (-250)
= (-34) . [ 50 + ( - 250) ]
= ( - 34 ) . ( -200)
= 6800
16.50. − 25 . − 250 = 5000000