Thực hiện phép tình:
a) 2 . 53 - 36 : 32
b) 47 - [30 + (6 - 2)2 ]
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2 . 125 - 36 : 9
= 250 - 4
= 246
= 47 - [ 30 + 42]
= 47 - [30 + 16 ]
= 47 - 46
= 1
a) -72.17+72.31 - 36 . 228
= -72.17 + 72. 31 - 36.2.114
= -72 .17 + 72 . 31 -72 . 114
= -72. ( 17-31+114)
= -72 . 100
= -7200
b) ..........
= -7 . ( 16-36.9) -(-125)
= -7 . ( 16-324) +125
=-7 . ( -308) +125
= 2156+125
= 2281
a)
�)−72.17+72.31−36.228-72.17+72.31-36.228
=−72.17+72.31−36.2.114=-72.17+72.31-36.2.114
=−72.17+72.31−72.114=-72.17+72.31-72.114
=72(31−17−114)=72(31-17-114)
=72.(−100)=−7200=72.(-100)=-7200
b)�)−7.[(−2)4+(−36):(−32)]−(−5)3-7.[(-2)4+(-36):(-32)]-(-5)3
=−7.[16−36:(−9)]+125=-7.[16-36:(-9)]+125
=−7.[16−−4]+125=-7.[16--4]+125
=−7.20+125=-7.20+125
=−140+125=-140+125
=−15=-15
c)�)(57−725)−(605−53)(57-725)-(605-53)
=57−725−605+53=57-725-605+53
=(57+53)−120=(57+53)-120
=110−120=−10
A, 32 * 47 + 32 * 53
= 32 * ( 47 + 53 )
= 32 * 100
= 3200 .
B, 875 + 5375 : 25 - 875
= 875 - 875 + 5375 : 25
= 0 + 2115
= 215 .
C, 5 * 25 * 2 * 16 * 4
= ( 5 * 2 * 16 ) * ( 25 * 4 )
= 160 * 100
= 16000 .
1) (-25).8.(-4).(-125)
= [(-25).4].[(-125).8]
=(-100).(-1000)
=100000
2)30.(5-10)
=30.5-30.10
=30.5-300
=150-300
=(-150)
3) 43.(53-81)+53.(81-43)
=43.53-43.81+53.81-53.43
=(43.53-53.43)+(43.81-53.81)
=0+81.(43-53)
=(-810)
4) Mk chưa biết làm nha
1) (-25).8.(-4).(-125)
= [ (-25) . (-4) ] . [ 8 . (-125) ]
= 100 . (-1000)
= -100 000
2) 30.(-5-10)
= 30 . (-15)
= -450
3) 43.(53-81)+53.(81-43)
= 43 . 53 - 43 . 81 + 53 . 81 - 53.43
= -43 . 81 + 53 . 81
= 81 . ( -43 + 53)
= 81 . 10
= 810
4) (-6)².(-17)+23.(-36)-72.30
= 36 . (-17) + 23 . (-36) - 72. 30
= (-36) . 17 + 23 . (-36) - 72 . 30
= (-36) . ( 17 + 23 ) - 72 . 30
= (-36) . 40 - 72.30
= (-1440 )- 2160
= -3600
# HOK TỐT #
Bài 2: Tính nhanh
a) 29 + 132 + 237 + 868 + 3
= 29+(132+858)+(237+3)
=29+990+240
=1259
a) \(31\cdot72+\left(-31\right)\cdot70-2\cdot70\)
\(=31\cdot72-31\cdot70-2\cdot70\)
\(=31\cdot\left(72-70\right)-2\cdot70\)
\(=31\cdot2-2\cdot70\)
\(=2\cdot\left(31-70\right)\)
\(=2\cdot-39\)
\(=-78\)
b) \(25\cdot\left(32+17\right)-32\cdot\left(25+47\right)\)
\(=25\cdot32+25\cdot17-32\cdot25-32\cdot47\)
\(=25\cdot\left(32-32+17\right)-32\cdot47\)
\(=25\cdot17-32\cdot47\)
\(=425-1504\)
\(=-1079\)
a ) 48 - 73 + |15| - ( - 29 )
= -25 + 15 + 29 = 19
b) 134 + 46.( 39 - 78 ) - | 267 |
= 134 + 46.( -39 ) - 267 = -133 -1794 = -1927
c) 36 - 16.( -2 )² + ( - 53 )
= 36 - 16.4 - 53 = -17 - 64 = -81
d) ( 259 - 47 - 5 ) - ( 259 - 5 )
= 259 - 47 - 5 - 259 + 5 = - 5 + 5 + 259 - 259 = 0
e ) 325. 26 - 325 . 125 - 325
= 325 (26 - 125 - 1) = 325. (-100) = -32500
a, 53.(-15)+(-15).47
=(-15)(53+47)
=(-15).100
=-1500
b, 43.(53-81)+53.(81-43)
=43.(-28)+53.38
=810
c,(-5).8+53.(81-43)
=-45+53.38
=1969
d, ban tu giai nốt
a,-15 . (53+47)
= -15 . 100
=-1500
b,43.53-43.81+53.81-43.53
=(43.53-43.53)+81.(-43+53)
= 0 + 81.10
=0+810
=810
c,-40+-8
=-48
d,3.16+(-10)-20
=48+(-10)-20
=38-20
=18
208 - 84: 12= 208- 7= 201
5^6 : 5^3 + 2^3.2^2= 5^3 + 2^5= 125 + 32= 1577
15 . 2^3 + 4 . 3^2 - 5.7= 15 . 8 + 4. 9 - 5.7= 120 + 36 - 35=156 - 35=121
164 . 53 + 47 . 164= 164.(53 + 47)=164. 100=16400
a: \(=2\cdot125-36:9=250-4=246\)
b: \(=47-30-4^2=17-16=1\)