mk nhầm đọc ko kĩ đề nhân 4 tưởng nhân 2^^
\(\text{480+45.4=(x+125):5+260 }\\ \left(x+125\right):5+260=660\\ \left(x+125\right):5=660-260=400\\ x+125=400.5=2000\\ x=2000-125=1875\)
\(\text{480+45.4=(x+125):5+260 }\\ \left(x +125\right):5+260=570\\ \left(x+125\right):5=570-260=310\\ \left(x+125\right)=310.5=1550\\ x=1550-125=1425\)