BẢN MỀM Toán tìm x lớp 4 nâng cao

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BẢN MỀM Toán tìm x lớp 4 nâng cao được yopovn sưu tầm.

Chuyên đỀ I:  tìm thành phần chưa biết của phép tính Lớp 4-5

 

Câu 1: Tìm Y:

Y x 243 = 22842                                                                Y x 132 + 100 = 3796

1231 – ( 1610 : Y ) = 909                                                  ( 129 – Y ) x 545 = 51230

Câu 2: Tìm Y:

6210 : ( Y – 25 ) = 30                                                        3600 : ( 200 – Y )  = 20

Y : 6 : 10 = 57                                                                    ( Y + 27 ) : 12 = 15

Câu 3: Tìm X:

196 x ( a : a – 1 ) + X = 58                                                X x 95 + X x 4 + X = 129 x 8

Câu 4: Tìm X:

59 + 27 : X = 62                                                       2475 : ( X : 8 – 216 ) = 1

X : 9 ( 2762 – 1389 ) = 207                                     X x ( 21 : 3 ) = 2200 + 82

186 x X – 85 x X – x = 3400                                   1245 : X + 64 : X – 35 : X + 26 :X

Câu 5: Tìm X:

X x 15 – 200 = X x 9 + 100                                                 X x (21 : 3 ) = 2200 + 82

X x 5 + X x 7 - X – X = 27 + 73                                         X x 101 = 1111 - 404

Câu 6: Tìm X:

X x 32 – 185 = X x 7 + 415                                                316 – [ 79 x ( X – 23 ) ] = 0

1284 – [ 61 x ( 126 x X ) ] = 3                                            ( 53 x 31 x X ) : 4929 = 1

Câu 7: Tìm X:

398 + X : 25 x 6 = 422                                                          X x 9 – 10 + 11 = 361

X x X x 7 = 252                                                                     96 – 96 : X x 8 = 16 x 2

X x 15 + 48 = X x 3 + 120                                                X + X x 11 + X x 12 = 4896

Câu 8: Tìm X:

X x 109 – X x 94 – X x 4 = 125 x 4                                  1xX+2xX+3xX+4xX = 48x5

XXX + XX + X = 492                                                           XXX + XX + X + X = 992

Câu 9: Tìm X:

X x 11 + X + X + X = 2954                                                  X x 243 – 21819 = 27

8208: X – 108 = 0                                                                 526 x ( X – 145 ) = 13150

Câu 10: Tìm X:

( X : 273 ) – 946 = 754                                    X x (365+247) = 365x123+123x247

Câu 11: Tìm a, biết:       678 x 91 – 678 x a = 6780

Câu 12: Tìm Y, biết:       2020 – 365 + 948 : Y = 1655 + 948 : 4

Câu 13: Tìm Y, biết:        Y x ( 365 + 247 ) = 365 x 123 + 123 x 247

Câu 14: Tìm Y, biết:

41,75 + Y + 27,3 = 100,5                                                      Y + 27,9 – 93,7 = 48,75

Y x 2,4 : 2,5 = 1,44                                                               Y : 2,4 : 2,5 = 1,44

Câu 15: Tìm X:

7,2 + X : 4 = 10,8                                                                      X x 4 – 7,2 = 10,8

X : 0,5 + X : 0,125 = 9,78                                                         2,5 x X x 6,5 = 152,75

Câu 16: Tìm x

     x + 678 = 2813             4529 + x = 7685             x - 358 = 4768              2495 - x  = 698

     x  x 23 = 3082              36 x x = 27612               x : 42 = 938                  4080 : x = 24

 Câu 17: Tìm x

  1. x + 6734 = 3478 + 5782 2054 + x  = 4725 - 279

- 3254 = 237 x 145                                                   124 - x  = 44658 : 54

 Câu 18: Tìm x

  1. x x 24 = 3027 + 2589 42 x x  = 24024 - 8274

x : 54 = 246 x 185                                                        134260 : x  = 13230 : 54

 Câu 19*: Tìm x

  1. ( x + 268) x 137 = 48498 ( x + 3217) : 215 = 348

( x - 2048) : 145 = 246                                                       (2043 - x) x 84 = 132552

 Câu 20*: Tìm x

  1. x x 124 + 5276 = 48304                                                  x x 45 - 3209 = 13036

x : 125 x 64 = 4608                                                           x : 48  : 25 = 374

  1. 12925 : x + 3247 = 3522 17658 : x - 178 = 149

15892 : x  x 96 = 5568                                                        117504 : x  : 72 = 48

 Câu 21*: Tìm x

75 x ( x + 157) = 24450                                                         14700 : ( x + 47) = 84

69 x ( x - 157) = 18837                                                        41846 : ( x - 384) = 98

  1. 7649 + x x 54 = 33137                                                        35320 -  x 72 = 13072

4057 + ( x : 38) = 20395                                                    21683 - ( x : 47) = 4857

Câu 22*: Tìm x

  1. 327 x (126 + x) = 67035 10208 : (108 + x) = 58
  2. 68 x (236 - x) = 9860 17856 : (405 - x) = 48
  3. 4768 + 85 x x = 25763 43575 - 75 x x = 4275
  4. 3257 + 25286 : x = 3304 3132 - 19832 : x = 3058

Câu 23*: Tìm x

x 62 + x 48 = 4200      x  x 186 - x  x 86 = 3400           x 623 - x  x 123 = 1000

x 75 + 57 x x  = 32604      125 x x  - x  x 47 = 25350

216 : x + 34 : x = 10           2125 : x - 125 : x  = 100

Câu 24*: Tìm x

  x x a = aa                ab x x = abab                    abc x x = abcabc          aboabo : x = ab

 Câu 25*: Tìm x

  xx + x + 5 = 125                                                         xxx - xx - x - 25 = 4430

  xxx + xx + x + x = 992                                               xxx + xx + x + x + x + 1 = 1001

  4725 + xxx + xx + x  = 54909                                    35655 - xxx - xx - x  = 5274

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