\(\frac{5}{4}-\left(\frac{1}{8}+\frac{1}{3}+\frac{1}{10}.4\right)=?\)
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1.
\(\frac{2x+3}{4}-\frac{5x+3}{6}=\frac{3-4x}{12}\)
\(MC:12\)
Quy đồng :
\(\Rightarrow\frac{3.\left(2x+3\right)}{12}-\left(\frac{2.\left(5x+3\right)}{12}\right)=\frac{3x-4}{12}\)
\(\frac{6x+9}{12}-\left(\frac{10x+6}{12}\right)=\frac{3x-4}{12}\)
\(\Leftrightarrow6x+9-\left(10x+6\right)=3x-4\)
\(\Leftrightarrow6x+9-3x=-4-9+16\)
\(\Leftrightarrow-7x=3\)
\(\Leftrightarrow x=\frac{-3}{7}\)
2.\(\frac{3.\left(2x+1\right)}{4}-1=\frac{15x-1}{10}\)
\(MC:20\)
Quy đồng :
\(\frac{15.\left(2x+1\right)}{20}-\frac{20}{20}=\frac{2.\left(15x-1\right)}{20}\)
\(\Leftrightarrow15\left(2x+1\right)-20=2\left(15x-1\right)\)
\(\Leftrightarrow30x+15-20=15x-2\)
\(\Leftrightarrow15x=3\)
\(\Leftrightarrow x=\frac{3}{15}=\frac{1}{5}\)
3/8-1/5-1/3+5/8-10/7-4/7+1/3
=(3/8+5/8)-(1/3-1/3)-1/5-(10/7+4/7)
=1-0-1/5-2
=4/5-2
=-6/5
\(\left(\frac{3}{8}-\frac{1}{5}-\frac{1}{3}\right)+\left(\frac{5}{8}-\frac{10}{7}-\frac{4}{7}\right)+\frac{1}{3}\)
\(=\frac{3}{8}-\frac{1}{5}-\frac{1}{3}+\frac{5}{8}-\frac{10}{7}-\frac{4}{7}+\frac{1}{3}\)
\(=\left(\frac{3}{8}+\frac{5}{8}\right)+\left(\frac{-1}{3}+\frac{1}{3}\right)-\left(\frac{10}{7}+\frac{4}{7}\right)-\frac{1}{5}\)
\(=1+0-2-\frac{1}{5}\)
\(=\left(-1\right)-\frac{1}{5}\)
\(=\frac{-6}{5}\)
47/120
\(\frac{47}{120}\)
toán lớp 1 mà có phân số sao