75%*x+3/4[ba phần tư]*x+x=30
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-0,6x - \(\frac{-3}{4}\)x + x - \(\frac{1}{4}\) = \(\frac{23}{4}\)
-0,6x - \(\frac{-3}{4}\)x + 1x - \(\frac{1}{4}\)= \(\frac{23}{4}\)
x . ( -0,6 - \(\frac{-3}{4}\)+ 1 - \(\frac{1}{4}\)) = \(\frac{23}{4}\)
x . \(\frac{9}{10}\) = \(\frac{23}{4}\)
x = \(\frac{23}{4}\): \(\frac{9}{10}\)
x = \(\frac{115}{18}\)
x.
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CÁC EM TỰ LÀ ĐI MẤY BÀI NÀY DỄ LĂM CHỊ HỌC LỚP 8 NÊN CHỊ BIẾT NHƯNG ĐỪNG BẢO CHỊ LÀ CHO HAY GỢI Ý CÁCH LÀM NHA.
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a) \((133-x):5=26\)
\(\implies 133-x=26\times5\)
\(\implies 133-x=130\)
\(\implies x=133-130\)
\(\implies x=3\). Vậy x=3.
b)\((3\times x-4):2-\frac{1}{4}=\frac{3}{4}\)
\(\implies (3\times x -4):2=\frac{3}{4}+\frac{1}{4}\)
\(\implies (3\times x -4):2=1\)
\(\implies 3\times x-4=2\)
\(\implies 3\times x=6\)
\(\implies x=2\). Vậy x=2.
c) \((2\times x-3)\times 3-5=10\)
\(\implies (2\times x-3)\times3 =10-5\)
\(\implies (2\times x-3)\times 3=5\)
\(\implies 2\times x-3=\frac{5}{3}\)
\(\implies 2\times x=\frac{5}{3}+3\)
\(\implies 2\times x=\frac{14}{3}\)
\(\implies x=\frac{14}{3}:2\)
\(\implies x=\frac{7}{3}\). Vậy \(x=\frac{7}{3}\)
\(75\%x+\frac{3}{4}x+x=30\)
\(\frac{3}{4}x+\frac{3}{4}x+x=30\)
\(\left(\frac{3}{4}+\frac{3}{4}+1\right)x=30\)
\(\frac{5}{2}x=30\)
\(x=30:\frac{5}{2}\)
\(x=12\)