Tính nhanh
a) 2.(-25).(-4).50
b)-125.5.(-8).2
c) 16.50.(-25).(-250)
tính nhanh
a)A=1-2-3+4+5-6-7+8+....+2018
b)16.50.(-25).(-250)+(-1)3.[(-10)3-(-42)]
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
------------------------------------
(-1)3.[(-10)3-(-42)] = 984
-----------------------------------
5000000 + 984 = 5000984
Tính
a) 2.(-25).(-4).50
b) 16.50.(-25).(-250)
c) (-167).(-83)+167.17-33
d) (135-35).47-53.(-48-52)
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
Tính
a) 2.(-25).(-4).50
b) 16.50.(-25).(250)
c) (-167).(-83) +167.17 -33
d) (135 -35).47 - 53.(-48 -52)
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
Tính: 16.50.(-25).(-250)
Tính: 16.50.(-25).(-250)
Thực hiện phép tính (tính nhanh nếu có thể)
a) 2.( 25).( 4).50
( -125).5.( -16).( -8)
c) ( 5)2 .( 3)3 .2
d)(- 4 ).32 .( -5)3
a: \(2\cdot25\cdot4\cdot50\)
\(=\left(2\cdot50\right)\cdot\left(25\cdot4\right)\)
\(=100\cdot100=10000\)
b: \(\left(-125\right)\cdot5\cdot\left(-16\right)\cdot\left(-8\right)\)
\(=-125\cdot5\cdot16\cdot8\)
\(=-\left(125\cdot8\right)\cdot\left(5\cdot16\right)\)
\(=-80\cdot1000=-80000\)
c: \(5^2\cdot3^3\cdot2\)
\(=25\cdot27\cdot2\)
\(=\left(25\cdot2\right)\cdot27=27\cdot50=1350\)
d: \(\left(-4\right)\cdot3^2\left(-5\right)^3\)
\(=\left(-4\right)\cdot\left(-125\right)\cdot9\)
\(=500\cdot9=4500\)
a) 2⋅25⋅4⋅50
=(2⋅50)⋅(25⋅4)
=100⋅100
=10000
b) (−125)⋅5⋅(−16)⋅(−8)
=−125⋅5⋅16⋅8
=−(125⋅8)⋅(5⋅16)
=−80⋅1000
=−80000
c) 5\(^2\)⋅3\(^3\)⋅2
=25⋅27⋅2
=(25⋅2)⋅27
=27⋅50
=1350
d) (−4)⋅3\(^2\)(−5)\(^3\)
=(−4)⋅(−125)⋅9
=500⋅9
=4500
tính nhanh hợp lí
-125.5.(-4).(-8).(-25)
-125.5.(-4).(-8).(-25)
=[(-125).(-8)].[(-25).(-4)].5
=1000.100.5
=500000
Tính nhanh:
a, 12 400 : 50
b, 360 : 15
c, 23 800 : 25
\(12400:50=248\cdot50:50=248\)
\(360:15=24\cdot15:15=24\)
\(23800:25=952\cdot25:25=952\)
a ] 12 400 : 50 = 248
b ] 360 : 15 = 24
c ] 23800 : 25 = 952
Tính nhanh
a)-25.(35+147)+35.(25+147)
b)125.9.(-4).(-8).25.7
c)-42.276+42.176
d)(-25).68+(-34).(-250)
a,-25.(35+147)+35.(25+147)
=-25.35+147+35.25+147
=(-25+25).35+147
=35+147
=182