Chuyên đề Toán 3: Tìm x

Hoctoancungthukhoa.com Liên hệ: 0964.73.22.88 
Hoctoancungthukhoa.com 
Chuyên đề: Tìm x 
Bài 1:Tìm x 
a, 𝑥 + 53 = 98 
b, 72 + 𝑥 = 109 
c, 𝑥 − 34 = 92 
d, 583 − 𝑥 = 37 
e, 𝑥 ∶ 6 = 7 
f, 𝑥 ∶ 9 = 54 
g, 𝑥 × 5 = 150 
h, 𝑥 × 9 = 567 
i, 504 ∶ 𝑥 = 6 
k, 216 ∶ 𝑥 = 72 
Bài 2: Tìm x 
a, 𝑥 + 632 − 86 = 872 
b, 𝑥 + 3257 = 6258 − 323 
c, 4832 − 𝑥 = 2684 + 369 
d, 4673 − 876 + 𝑥 = 8271 
e, 𝑥 × 9 + 7 × 89 = 1604 
f, 984 ∶ 𝑥 = 32 × 8 − 62 × 4 
Bài 3: Tìm x 
a, 𝑥 × 5 + 87 = 282 
b, 983 − 𝑥 × 8 = 173 
c, 736 − 𝑥 ∶ 3 = 106 
d, 125 × 4 − 𝑥 = 43 + 26 
e, 𝑥 − 10 × 5 = 100 − 80 
f, 𝑥 × 5 + 122 + 236 = 633 
g, 320 + 3 × 𝑥 = 620 
h, 120 − 𝑥 × 3 = 30 × 3 
I, 𝑥 + 3 : 6 = 5 + 2 
k,𝑥 × 8 − 22 = 13 × 2
Bài 4: Tìmy
a, 720 ∶ 𝑥 × 2 + 𝑥 × 3 = 2 × 3 
b, 𝑥 + 13 + 6 × 𝑥 = 62 
c, 7 × (𝑥 − 11) − 6 = 757 
d, 𝑥 + 𝑥 + 5 × 3 = 75 
e, 𝑥: 12 × 7 + 8 = 36 
f, , 𝑥 ∶ 4 × 7 = 252 
g, 7 + 𝑥 × 4 + 𝑥 = 108 
h, 𝑥 + 15 : 3 = 3 × 8
Hoctoancungthukhoa.com Liên hệ: 0964.73.22.88 
Hoctoancungthukhoa.com 
Bài 5: Tìm x 
a, 357 ∶ 𝑥 = 5 (𝑑ư 7) 
b, 𝑥 ∶ 4 = 1234 (𝑑ư 3) 
c, 357 ∶ 𝑥 + 5 = 5 (𝑑ư 7) 
d, 65 ∶ 𝑥 = 21 (𝑑ư 2) 
e, 64 ∶ 𝑥 = 9(𝑑ư 1) 
f, x : 5 = 389 (dư 4) 
Bài 6: Tìm x 
a, 1 + 𝑥 + 2 + 𝑥 + 3 + 𝑥 + 4 + 𝑥) + 5 + 𝑥 = 10 × 5 
b, 𝑥 + 4 + 4 + ⋯ + 4 = 9 × 68
111 𝑠ố 4
c, 𝑥 − 1 − 2 − 3 − 4 − 5 − 6 = 0