Bài tập tìm X lớp 6 ôn thi học kì 1
Bài 1: Tìm X:
| a) 71 – (33 + X) = 26
b) (X + 73) – 26 = 76 c) 45 – (X + 9) = 6 d) 89 – (73 – X) = 20 e) (X + 7) – 25 = 13 f) 198 – (X + 4) = 120 |
g) 140 : (X – 8) = 7
h) 4(X + 41) = 400 i) 11(X – 9) = 77 j) 5(X – 9) = 350 k) 2X – 49 = 5.32 l) 200 – (2X + 6) = 43 |
m) 2(X- 51) = 2.23 + 20
n) 450 : (X – 19) = 50 o) 4(X – 3) = 72 – 110 p) 135 – 5(X + 4) = 35 q) 25 + 3(X – 8) = 106 r) 32(X + 4) – 52 = 5.22 |
Bài 2: Tìm X, biết:
| a) 156 – (X+ 61) = 82
b) (X-35) -120 = 0 c) 124 + (118 – X) = 217 d) 7X – 8 = 713 e) X- 36:18 = 12 f) (X- 36):18 = 12 g) (X-47) -115 = 0 |
h) 5X + X = 39 – 311:39
i) 7X – X = 521 : 519 + 3.22 – 70 j) 7X – 2X = 617: 615 + 44 : 11 k) 0 : X = 0 l) 3X = 9 m) 4X = 64 n) 2X = 16 |
o) 315 + (146 – X) = 401
p) (6X – 39 ) : 3 = 201 q) 23 + 3X = 56 : 53 r) 9X- 1 = 9 u) X4 = 16 v) 2X : 25 = 1 |
Bài 3: Tìm X:
| a) X – 7 = -5
b) 128 – 3 . ( X+4) = 23 c) [(6X – 39) : 7] . 4 = 12 d)( X: 3 – 4) . 5 = 15 |
a) |X + 2| = 0
b) |X – 5| = |-7| c) |X – 3 | = 7 – ( -2) d) (7 – X) – (25 + 7 ) = – 25 |
e)( 3X – 24 ) . 73 = 2 . 74
g) X – [42 + (-28)] = -8 e) |X – 3| = |5| + |-7| g) 4 – ( 7 – X) = X – ( 13 -4) |