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75 x (x + 157) = 24450
x + 157 = 24450 : 75
x = 326 - 157
x = 169
14700 : (x + 47) = 84
x + 47 = 14700 : 84
x = 175 - 47
x = 128
69 x (x - 157) = 18837
x - 157 = 18837 : 69
x = 273 + 157
x = 430
41846 : (x - 384) = 98
x - 384 = 41846 : 98
x = 427 + 384
x = 811
7649 + X x 54 = 33137
X x 54 = 33137 - 7649
x = 25488 : 54
x = 472
35320 - X x 72 = 13072
X x 72 = 35320 - 13072
x = 22248 : 72
x = 309
4057 + (x : 38) = 20395
x : 38 = 20395 - 4057
x = 16338 x 38
x = 620844
21683 - (x : 47) = 4857
x : 47 = 21683 - 4857
x = 16826 x 47
x = 790822
a ) 3885 / ( x * 21 ) = 37
x * 21 = 3885 : 37
x * 21 = 105
x = 105 : 21
x = 5
b ) 50343 : x = 405 ( dư 123 )
x = ( 50343 - 123 ) : 405
x = 50220 : 405
x = 124
c ) 3257 + 25286 : x = 3304
25286 : x = 3304 - 3257
25286 : x = 47
x = 25286 : 47
x = 538
a ) 3885 / ( x * 21 ) = 37
x * 21 = 3885 : 37
x * 21 = 105
x = 105 : 21
x = 5
b ) 50343 : x = 405 ( dư 123 )
x = ( 50343 - 123 ) : 405
x = 50220 : 405
x = 124
c ) 3257 + 25286 : x = 3304
25286 : x = 3304 - 3257
25286 : x = 47
x = 25286 : 47
x = 538
@_@ k mình nha
A. 327 x (126 + x) = 67035 10208 : (108 + x) = 58
126 + x = 67035 : 327 108 + x = 10208 : 58
126 + x = 205 108 + x = 176
x = 205 - 126 x = 176 - 108
x = 79 x = 68
B. 68 x (236 - x) = 9860 17856 : (405 - x) = 48
236 - x = 9860 : 68 405 - x = 17856 : 48
236 - x = 145 405 - x = 372
x = 145 + 236 x = 372 + 405
x = 381 x = 777
C. 4768 + 85 x X = 25763 43575 - 75 x X = 4275
85 x X = 25763 - 4768 75 x X = 43575 - 4275
85 x X = 20995 75 x X = 39301
X = 20995 : 85 X = 39301 : 75
X = - 4683 X = 524,01333333.......
D. 3257 + 25286 : x = 3304 3132 - 19832 : x = 3058
25286 : x = 3304 - 3257 19832 : x = 3132 - 3058
25286 : x = 47 19832 : x = 74
x = 25289 : 47 x = 19832 : 74
x = 538,063829.... x = 268
mỏi quá
a)
75 X(x+157)=24450
x+157 =24450:157
x+157 =326
x =326-7
x =319
b)41846: (x-384)=98
x-384 =41846:98
x-384 =427
x =427+384
x =811
x-384 =
a) 75 x ( X + 157 ) = 24450
X + 157 = 24450 : 75
X + 157 = 326
X = 326 - 157
X = 169
Vậy X = 169
b) 41846 : ( X - 384 ) = 98
X - 384 = 41846 : 98
X - 384 = 427
X = 427 + 384
X = 811
Vậy X = 811
1. A) 225886 + 779 × 8
= 225886 + 6232
= 232118
B) 125 × 5 × 20 × 8
= (125 × 8) × (5 × 20)
= 1000 × 100
= 100000
C) 47286 : 2 + 14765
= 23643 + 14765
= 38408
D) 91428 - 23560 : 5
= 91428 - 4712
= 86716
3. A) 36 × 532 + 63 × 532 + 532
= 532 × (36 + 63 + 1)
= 532 × 100
= 53200
B) 679 × 123 + 679 - 679 × 24
= 679 × (123 + 1 - 24)
= 679 × 100
= 67900
C) 245 × 327 - 245 × 18 - 9 × 245
= 246 × (327 - 18 - 9)
= 245 × 300
= 73500
Bài 1 :
a) 354 x 16 + 354 x 34
= 354 x ( 16 + 34 )
= 354 x 50
= 17700
a) 542 x 7 + 542 x 2 + 542
= 542 x 7 + 542 x 2 + 542 x 1
= 542 x (7 + 2 + 1)
= 542 x 10
= 5420
b) (126 x 35 + 157 x 55) x (132 - 6 x 22)
= (126 x 35 + 157 x 55) x (132 - 132)
= (126 x 35 + 157 x 55) x 0 (Số bất kỳ nào nhân với 0 vẫn = 0)
= 0
c) 897 x 99 + 897
= 897 x 99 + 897 x 1
= 897 x (99 + 1)
= 897 x 100
= 89700
a) \(542.7+542.2+542\)
\(=542.\left(2+7+1\right)\)
\(=542.10=5420\)
b) \(\left(126.35+157.55\right).\left(132-6.22\right)\)
\(=13045.0=0\)
c) \(897.99+897\)
\(=897.\left(99+1\right)\)
\(=897.100=89700\)