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a, =-25.21.4.(-3).(-1)
=-25.4.21.4
=-100.21.4
=-2100.4
=-8400
b, =-125.67.(-8).1
=-125.(-8).67
=1000.67
=67000
c, =35.18-35.28
=35.(18-28)
=35.(-10)
=-350
d, =24.11-16.24+16.5
=24.(11-16)+16.5
=24.(-5)+16.5
=5.(-24+16)
=5.(-8)
=-40
e, =29.6-19.29+19.13
=29.(6-19)+19.13
=29.(-13)+19.13
=13.(-29+19)
=13.(-10)
=-130
35 . 18 - 5 . 7 . 28
= 35.18-5.7.28
= 35 . 18 - 35 . 28
= 35 . ( 18 - 28 )
= 35 . ( - 10 )
= -350
D. 24.(16-5)-16.(24-5)
= 24 . 11 - 16 . 19
= 264 - 304
= -30
Câu 1:
a) Ta có: 2n+1 là số lẻ∀n
⇒\(\left(-1\right)^{2n+1}=-1\)
Ta có: \(\left(-25\right)\cdot21\cdot\left(-2\right)^2\cdot\left(-\left|-3\right|\right)\cdot\left(-1\right)^{2n+1}\)
\(=-25\cdot21\cdot4\cdot\left(-3\right)\cdot\left(-1\right)\)
\(=75\cdot84\cdot\left(-1\right)\)
\(=-6300\)
b) Ta có: \(\left(-5\right)^3\cdot67\cdot\left(-\left|-2^3\right|\right)\cdot\left(-1\right)^{2n}\)
\(=-125\cdot67\cdot\left(-8\right)\)
\(=1000\cdot67=67000\)
c) Ta có: \(35\cdot18-5\cdot7\cdot28\)
\(=35\cdot18-35\cdot28\)
\(=35\cdot\left(18-28\right)=35\cdot\left(-10\right)=-350\)
d) Ta có: \(24\cdot\left(16-5\right)-16\cdot\left(24-5\right)\)
\(=24\cdot16-24\cdot5-24\cdot16+16\cdot5\)
\(=-24\cdot5+16\cdot5\)
\(=5\cdot\left(-24+16\right)=5\cdot\left(-8\right)=-40\)
e) Ta có: \(29\cdot\left(19-13\right)-19\cdot\left(19-13\right)\)
\(=6\cdot\left(29-19\right)=6\cdot10=60\)
g)Sửa đề: \(31\cdot\left(-18\right)+31\cdot\left(-81\right)-31\)
Ta có: \(31\cdot\left(-18\right)+31\cdot\left(-81\right)-31\)
\(=31\cdot\left(-18-81-1\right)\)
\(=31\cdot\left(-100\right)=-3100\)
h) Ta có: \(\left(-12\right)\cdot47+\left(-12\right)\cdot52+\left(-12\right)\)
\(=-12\cdot\left(47+52+1\right)\)
\(=-12\cdot100=-1200\)
k) Ta có: \(13\cdot\left(23+22\right)-3\cdot\left(17+28\right)\)
\(=13\cdot45-3\cdot45\)
\(=45\cdot\left(13-3\right)=45\cdot10=450\)
m) Ta có: \(-48+48\cdot\left(-78\right)+48\cdot\left(-21\right)\)
\(=48\cdot\left(-1-78-21\right)\)
\(=48\cdot\left(-100\right)=-4800\)
n) Ta có: \(135\cdot\left(171-123\right)-171\cdot\left(135-123\right)\)
\(=135\cdot171-135\cdot123-171\cdot135+171\cdot123\)
\(=123\cdot\left(-135+171\right)=123\cdot36=4428\)
A, (-25). 21. (-2)2. (-|-3|). (-1)2015
B, (-5)3. 67. (-|-2|). (-1)2014
C, 35.18 – 5.7.28 + 35. (-90)
D, 24. (16 – 5) – 16. (24 – 5)
E, - 79. (73 – 27) – 73. (-79 + 27)
G, 31. (-18) + 31. (-8)-31
M, -48 + 48. (-78) + 48. (-21)
N, -|-17| + 2. [ 24: (-8) + (-5)2]
I, -|-7|. [(-2)4 + (-36): (-32)] – (-5)3
a) (-25) . 21. (-2)2. (-|-3|) . (-1)2n+1 (n thuộc N*)
=(-25).21.4.(-3).(-1)
=4.(-25).63
=63.(-100)=-6300
b, (-5)3 . 67. (-|-23|) . (-1)2n (n thuộc N*)
=(-5)3 . 67. (-23) . 1
=(5.2)3.67
=1000.67=67000
1/ 35. 18 – 5. 7. 28
= 35 . 18 - ( 5 . 7 ) . 28
= 35 . 18 - 35 . 28
= 35 . ( 18 - 28 )
= 35 . ( - 10 )
= - 350
2/ 45 – 5. (12 + 9)
= 45 - 5 . 21
= 45 - 105
= - 60
3/ 24. (16 – 5) – 16. (24 - 5)
= 24 . 11 - 16 . 19
= 264 - 304
= -40
4/ 29. (19 – 13) – 19. (29 – 13)
= 29 . 6 - 19 . 16
= 174 - 304
= - 130
5/ 31. (-18) + 31. ( - 81) – 31
= 31. ( -18 ) + 31 . (-81) + 31 . (-1)
= 31. [-18 + ( -81 ) + ( - 1 ) ]
= 31 . (-100)
= -3100
6/ (-12).47 + (-12). 52 + (-12)
= -12 . (47 + 52 + 1 )
= -12 . 100
= -1200
7/ 13. (23 + 22) – 3. (17 + 28)
= 13 . 45 - 3 . 45
= 45 . (13-3)
= 45 . 10
= 450
8/ -48 + 48. (-78) + 48. (-21)
= 48 . (-1) + 48. (-78) + 48. (-21)
= 48 . [-1 + (-78) + (-21)]
= 48 . (-100)
= -4800
1/ 35. 18 – 5. 7. 28 = 35.18-35.28 =35.(18-28)=35.(-10)=-350
2/ 45 – 5. (12 + 9) =5.9-5(12+9)=5.(9-12-9)=5.(-12)=-60
3/ 24. (16 – 5) – 16. (24 - 5) =24.16-24.5-16.24+16.5=5.(16-24)=5.(-8)=-40
4/ 29. (19 – 13) – 19. (29 – 13) = 29.19-29.13-19.29+19.13= 13.(19-29)=13.(-10)=-130
5/ 31. (-18) + 31. ( - 81) – 31 =31.(-18-81-1)=31.(-100)=-3100
6/ (-12).47 + (-12). 52 + (-12) = (-12).(47+52+1)=(-12).100=-1200
7/ 13. (23 + 22) – 3. (17 + 28) = 13.45 -3.45=45.(13-3)=45.10=450
8/ -48+48.(-78)+48.(-21) = 48.(-1-78-21)=48.(-100)=-4800