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