Bài làm :
Ta có :
\(8,75\times x+1,25\times2=26,3\)
\(\Leftrightarrow8,75\times x+2,5=26,3\)
\(\Leftrightarrow8,75\times x=26,3-2,5\)
\(\Leftrightarrow8,75\times x=23,8\)
\(\Leftrightarrow x=23,8\div8,75=2,72\)
Vậy x=2,72
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