2/6*60/53+2/6*46/53=
tính nhanh
53* 39+47*39-53*21-47*21
2*53*12+4*6*87-3*8*40
5*7*77-7*60+49*25-15*42
53x39+47x39-53x21-47x21
=39x ( 53+47) - 21x(53+47)
=39 x100 - 21x100
= 100x(39-21)
=100x18
=1800
2x53x12 +4x6x87 - 3x8x40
= (2x12)x53 + (4x16)x87 - (3x8) x40
= 24x53 + 24x87 + 24x40
= 24( 53+87+40)
= 24x180
=4320
a,53*39+47*39-53*21-47*21
=39*[53+47]-21*[53+47]
=39*100-21*100
=3900-2100
=1800
b,2*53*12+4*6*87-3*8*40
=[2*12]*53+[4*6]*87-[3*8]*40
=24*53+24*87-24*40
=24*[53+87-40]
=24*100
=2400
tính nhanh:
a:53*39+47*39-53*21-47*21
b:2*53*12+4*6*87-3*8*40
c:5*7*77-7*60+49*25-15*42
1 . Tính nhanh
a/ 15 . ( 27 + 18 + 6 ) + 15 . ( 23 + 12 )
b/ 14 . 35 . 5 + 10 . 25 .7 + 20 . 70
c/ 53 . ( 51 + 4 ) + 53 . ( 49 + 96 ) + 53
d/ 46 . ( 27 + 75 ) + 8 . ( 58 + 25 ) . 2
a) 15 . (27 + 18 + 6 ) + 15 . ( 23 +12 ) = 15. 51 + 15 . 35 = 765 + 525 = 1290
b) 14 . 35 . 5 + 10 . 25 . 7 + 20 . 70 = 2450 + 1750 + 1400 = 2452450
c) 53 . ( 51 + 4 ) + 53 . ( 49 + 96 ) + 53 = 53 . 55 + 53 . 145 + 53 = 2915 . 7685 = 22401775
d) 46 . ( 27 +75 ) +8 . ( 58 + 25 ) + 8 . ( 58 + 25 ) . 2 = 46 . 102 + 8 . 83 + 8 . 83 = 4692 + 664 + 664 = 6020
Tính
a) 2 023 - 252 : 53 + 27 b) 60: [ 7. ( 112 - 20. 6 ) + 5 ]
\(a, 2023 - 25^2 : 5^3 + 27\)
\(=\left(2023+27\right)-\left(5^2\right)^2:5^3\)
\(=2050-5^4:5^3\)
\(=2050-5\)
\(=2045\)
___
\(b,60:\left[7\cdot\left(11^2-20\cdot6\right)+5\right]\)
\(=60:\left[7\cdot\left(121-120\right)+5\right]\)
\(=60:\left(7\cdot1+5\right)\)
\(=60:\left(7+5\right)\)
\(=60:12\)
\(=5\)
#Toru
a) \(2023-25^2:5^3+27\)
\(=2023-5^4:5^3+27\)
\(=2023-5+27\)
\(=2018+27\)
\(=2045\)
b) \(60:\left[7.\left(11^2-20.6\right)+5\right]\)
\(=60:\left[7.\left(121-120\right)+5\right]\)
\(=60:\left[7.1+5\right]\)
\(=60:\left[7+5\right]\)
\(=60:12\)
\(=5\)
\(#WendyDang\)
53*46+55*53-53*2/4+1
Tính nhanh :
a)53 . 39 + 47 . 39 - 53 . 21 - 47 . 21
b)2. 53 . 12 + 4 . 6 . 87 - 3 . 8 . 40
c)5 . 7 . 77 - 7 . 60 + 49 . 25 - 15 . 42
Bài 7: Tính nhanh
c) 3. 25. 8 + 4. 37. 6 + 2. 38. 12 d) (1200 + 60) : 12
e) 12.53 + 53. 172 – 53. 84 g) (2100 – 42) : 21
h) 39.8 + 60.2 + 21.8 i) 36.28 + 36.82 + 64.69 + 64.41
k) 32. 47 + 32. 53 l) 37.7 + 80.3 +43.7
m) 113.38 + 113.62 + 87.62 + 87.38 n) 123.456 + 456.321 –256.444
p) 43.37 + 93.43 + 57.61 + 69.57 q) 38. 63 + 37. 38
r) 35.34 +35.38 + 65.75 + 65.45
c, 3.25.8 + 4.37.6 + 2.38.12
= (3.8).25 + (4.6).37 + (2.12).38
= 24.25 + 24.37 + 24.38
= 24.(25 + 37 + 38)
= 24.100
= 2400
d, (1200 + 60):12
= 1200: 12 + 60: 12
= 100 + 5
= 105
e, 12.53 + 53.172 - 53.84
= 53.(12 + 172 - 84)
= 153.( 184 - 84)
= 153. 100
= 15300
Bài 7: Tính nhanh
c) 3. 25. 8 + 4. 37. 6 + 2. 38. 12 d) (1200 + 60) : 12
e) 12.53 + 53. 172 – 53. 84 g) (2100 – 42) : 21
h) 39.8 + 60.2 + 21.8 i) 36.28 + 36.82 + 64.69 + 64.41
c) 3. 25. 8 + 4. 37. 6 + 2. 38. 12
= 24. 25 + 24 . 37 + 24.38
= 24.(25 +37+ 38)
= 24. 100 = 2400
d) (1200 + 60) : 12
= 1200 : 12 + 60: 12
= 100 + 5 = 105
e) 12.53 + 53. 172 – 53. 84
= 53 . ( 12+ 172 - 84)
= 53 . 100 = 5300
g) (2100 – 42) : 21
= 2100 : 21 - 42: 21
= 100 - 2 = 98
h) 39.8 + 60.2 + 21.8
= 39 .8 + 60 . 2 + 21 . 8
= 8.( 39 + 21) + 120
= 8 . 60 + 120 = 480 + 120 = 600
i) 36.28 + 36.82 + 64.69 + 64.41
= 36.(28 + 82) + 64.( 69 + 41) = 36. 110 + 64 . 110 = 110.( 36 + 64) =110. 100 = 11000
Nhớ tick nha em chị làm mãi mới được đấy
B= (-359)+181-123+350-172 C= -69+53+46-94-14+78 D= -199+(-200)-201 F= (-2)+4-6+8-10+12 G= (42-69+17)-(42+17)
D=(-199-201)-200=-400-200=-600