a) \(\frac{3}{4}\times x+\frac{1}{2}\times x-15=35\)
\(\left(\frac{3}{4}+\frac{1}{2}\right)\times x=35+15\)
\(\left(\frac{3}{4}+\frac{1}{2}\right)\times x=50\)
\(\frac{5}{4}\times x=50\)
\(x=50\div\frac{5}{4}\)
\(x=40\)
b) \(\frac{27,5\times8,4}{x}\times7=21\)
\(27,5\times8,4\div x=21\div7\)
\(27,5\times8,4\div x=3\)
\(231\div x=3\)
\(x=231\div3\)
\(x=77\)
a, Xx(3/4+1/2)=35+15
Xx 5/4=50
X=50:5/4
X=40
b, mình ko biết "8,4/x"
Thank you 2 bạn
