X + 300 = 800 X X 5 = 45 Y – 47 = 200Y

3. - BAI 14 TOAN HOC SINH GIOI
BAI 14 TOAN HOC SINH GIOI

3. Tìm x, y:

x + 300 = 800 x

x

5 = 45 y – 47 = 200

y : 3 = 6 1000 - x = 300 y : 4 = 1