4. Dạng Toán Tìm X A. 1. X x 5 + 122 +236 = 633 320 + 3 x X = 620 357: X= 5 du 7 X: 4 = 1234 du 3 120 - (X x 3) = 30 x 3 6.357: (X+5) = 5 du 712. 64: X = 9 du 1 (X+3):6=5+2 2. 3. 4. 5. 7. 65: x= 21 du 2 8. 9. Xx 8-22 = 13 x 2 10. 720 (X x 2 + Xx 3) = 2 x 3
