56x5=280
99x2=198
x+3=9
=>x=9-3
x=6
56 x 5 = 280
99 x 2 = 198
x + 3 = 9
x = 9 - 3
x = 6
Vậy x = 6
#Hok tốt
56 X 5 =280
99 X 2 =198
X + 3 = 9
X = 9 - 3
X = 6
56*5=280
99*2=198
x+3=9
x=9-3
x=6
56 × 5 = 280
99 × 2 = 198
x + 3 = 9
x = 9 - 3
x = 6
Vậy x = 6