Question

[Kudo Shinichi AKIRA^_^]

Bài4:Tìm x:

a.      124 + (118 – x) = 217 b.      7x – 8 = 713 c.       x- 36:18 = 12 d.      (x- 36):18 = 12 e.      (x-47) -115 = 0 f.        315 + (146 – x) = 401

g.      (6x – 39 ) : 3 = 201 h.      23 + 3x = 56 : 53 i.                  5x + x = 39 – 311:39 j.        7x – x = 521 : 519 + 3.22 - 70 k.      7x – 2x = 617: 615 + 44 : 11 l.        0 : x = 0

m.   3x = 9 n.      4x = 64 o.      2x = 16 p.      9x- 1 = 9 q.      x4 = 16 r.       2x : 25 = 1

Bài4:Tínhnhanh

1.      58.75 + 58.50 – 58.25 2.      27.39 + 27.63 – 2.27 3.      128.46 + 128.32 + 128.22 4.      87.23 + 13.93 + 70.87

5.      12.35 + 35.182 – 35.94 6.      48.19 + 48.115 + 134.52 7.      27.121 – 87.27 + 73.34 8.      136.23 + 136.17 – 40.36 9.      125.98 – 125.46 – 52.25

10.  17.93 + 116.83 + 17.233 11. 5.23 + 35.41 + 64.65 12. 29.87 – 29.23 + 64.71 13. 19.27 + 47.81 + 19.20

Answer 1

[phan thi ngoc mai]

chi chi mà cả nhả

Answer 2

[Nguyễn Lê Phước Thịnh]

b: Ta có: 7x-8=713

nên 7x=721

hay x=103

c: Ta có: x-36:18=12

nên x-2=12

hay x=14

d: Ta có: (x-36):18=12

nên x-36=216

hay x=252