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a: \(3^8:3^4+2^2\cdot2^3\)
=81+32
=123
b: \(3\cdot4^2-2\cdot3^2\)
\(=48-18\)
=30
a, 38: 34+ 22. 23
= 38-4 + 22+3
= 34 + 25
= 81 + 32
= 113
b, 3 . 42- 2 . 32
= 3 . 16 - 2 . 9
= 48 - 18
= 30
c, 84 : 4 + 39: 37+ 50
= 84 : 4 + 32 + 1
= 84 : 4 + 9 + 1
= 21 + 9 + 1
= 31
d, 295 - ( 31 - 22 . 5)2
= 295 - ( 31 - 4 . 5 )2
= 295 - ( 31 - 20 )2
= 295 - 112
= 295 - 121
= 174
e, 500 - {5[409 - (23 . 3 - 21)2 ] + 103 } : 15
= 500 - {5[409 - (8 . 3 - 21)2 ] + 103 } : 15
= 500 - {5[409 - (24 - 21)2 ] + 103 } : 15
= 500 - {5[409 - 32 ]+ 103 } : 15
= 500 - {5[409 - 9 ]+ 103 } : 15
= 500 - {5 . 400 + 1000 } : 15
= 500 - {2000 + 1000} : 15
= 500 - 3000 : 15
= 500 - 200
= 300
g, 53 . 2 - 100 : 4 + 23 . 5
= 125 . 2 - 100 : 4 + 8 . 5
= 250 - 25 + 40
= 225 + 40
= 265
h, 205 - [1200 - (42 - 2 . 3)3 ] : 40
= 205 - [ 1200 - ( 16 - 2 . 3 )3 : 40
= 205 - [ 1200 - ( 16 - 6 )3 ] : 40
= 205 - [ 1200 - 103 ] : 40
= 205 - [ 1200 - 1000 ] : 40
= 205 - 200 : 40
= 205 - 5
= 200
Đây nha bạn!!!
a, 75 + 58.50 – 58.25 = 3.25 + 58.(50 – 25) = 3.25 + 58.25 = 25.(3+58) = 25.61 = 1525
Ta có: 1525 = 5 2 . 61
b, 20: 2 2 – 5 9 : 5 8 = 20:4 – 5 = 5 – 5 = 0
c, 5 19 : 5 17 - 4 : 7 = 5 2 - 4 : 7 = (25 – 4):7 = 3
d, 47 - 45 . 2 4 - 5 2 . 12 : 14 = 47 – (45.16 – 25.12):14 = 47 – (720 – 300):14 = 47 – 420:14 = 47 – 30 = 17
e, 10 2 : 60 : 5 6 : 5 4 - 3 . 5 = 100 – 60: 5 2 - 15 = 100 – 60:(25 – 15) = 100 – 60:10 = 100 – 6 = 94
Ta có: 94 = 2.47
f, 2345 - 1000 : 19 - 2 21 - 18 2 = 2345 – 1000:(19 – 2. 3 2 ) = 2345 – 1000:(19 – 2.9) = 2345 – 1000:(19 – 18) = 2345 – 1000:1 = 2345 – 1000 = 1345
Ta có: 1345 = 3.269
g, 500 – {5.[409 – 2 3 . 3 - 21 2 ]+ 10 3 }:15 = 500 – {5.[409 – 8 . 3 - 21 2 ]+1000}:15 = 500 – {5.[409 – 3 2 ]+1000}:15 = 500 – {5.(409 – 9)+1000}:15 = 500 – {5.400+1000}:15 = 500 – (2000+1000):15 = 500 – 3000:15 = 500 – 200 = 300
Ta có: 300 = 2 2 . 3 . 5 2
h, 967 – [8 + 2 . 3 2 – 24:6 + 9 - 7 3 ].5 = 967 – [8+2.9 – 4+8].5 = 967 – 30.5 = 967 – 150 = 817
Ta có: 817 = 19.43
a: \(=47-\left[\left(45\cdot16-25\cdot12\right):14\right]\)
\(=47-30=17\)
b: \(=50-\left[6+34\right]\)
=50-40
=10
J.
=2345-1000:[19-2*(3^2)]
=2345-1000:[19-18]
=2345-1000:1
=2345-1000
=1345
F.
=(11^2)-(3^2)*-3+50
=[(11-3)^2]*-3+50
=(8^2)*-3+50
=64-3+50
=61+50
=111
E.
=295+(31-4*5)
=295+(31-20)
=295+11
=306
mik het bit làm r
J. 2345-1000 : [ 19 - 2 ( 21 - 18 )2 ]
= 2345 - 1000 : [ 19 - 2.32 ]
= 2345 - 1000 : (19 - 18)
= 2345 - 1000
= 1345.
F. 1125 : 1123 - 33 + 50
= 112 - 27 + 50
= 121 - 27 + 50
= 144
E. 295 + ( 31 - 22 . 5 )2
= 295 + (31 - 4.5)2
= 295 + 112
= 295 + 121
= 416
H. 47 + ( 45 . 24 - 52 . 12) : 14
= 47 + (45 . 16 - 25.12) : 14
= 47 + 420 : 14
= 47 + 30
= 77
I. 102 - 60 : ( 56 : 54 - 3 . 5 )
= 100 - 60 : (25 - 15)
= 100 - 60 : 10
= 100 - 6
= 94.
K. 205 + [ 1200 - ( 42 - 2 . 3 ) 3 ] : 40
= 205 + [1200 - (16 - 6)3 ] : 40
= 205 + [1200 - 1000] : 40
= 205 + 200 : 40
= 205 + 5
= 210
L. 500 - { 5 . [ 409 - ( 23 . 3 - 21 ) 2 ] + 103 } : 15
= 500 - {5 . [409 - (24 - 21)2 ] + 1000} : 15
= 500 - {5 . [409 - 9] + 1000}: 15
= 500 - {5.400+1000}:15
= 500 -3000:15
= 500 - 200
= 300.