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\(\frac{5\times x}{x-13}=49\times0,5-7\times0,5+0,25\)
\(\Rightarrow\frac{5\times x}{x-13}=0,5\times\left(49-7\right)+0,25\)
\(\Rightarrow\frac{5\times x}{x-13}=0,5\times42+0,25\)
\(\Rightarrow\frac{5\times x}{x-13}=21,25\)
\(\Rightarrow5\times x:x-13=21,25\)
\(\Rightarrow5\times1x=34,25\)
\(\Rightarrow1x=6,85\)
\(\Rightarrow x=6,85\)
#)Giải :
a) \(\frac{2xX-4,36}{0,125}=\)0,25 x 42,9 - 11,7 x 0,25 + 0,25 x 0,8
\(\frac{2xX-4,36}{0,125}=\)0,25 x ( 42,9 - 11,7 + 0,8 )
\(\frac{2xX-4,36}{0,125}=\)0,25 x 32
\(\frac{2xX-4,36}{0,125}=8\)
\(2xX-4,36=8x0,125\)
\(2xX-4,36=1\)
\(2xX=1+4,36\)
\(2xX=5,36\)
\(X=5,36:2\)
\(X=2,68\)
#~Will~be~Pens~#
\(=\frac{4}{11}\times\left(\frac{5}{13}+\frac{8}{13}\right)\)
\(=\frac{4}{11}\times1\)
\(=\frac{4}{11}\)
Chúc cậu học tốt
\(=\frac{4}{11}\times\left(\frac{5}{13}+\frac{8}{13}\right)\)
\(=\frac{4}{11}\times1\)
\(=\frac{4}{11}\)
a) \(\frac{21\times11\times2\times17\times4}{11\times17\times21\times3}=\frac{2\times4}{3}_{ }=\frac{8}{3}\)
b)\(\frac{5\times7\times13\times2}{7\times2\times13\times5\times5}=\frac{1}{5}\)
a)\(\frac{21x22x68}{11x17x63}\) = \(\frac{1x2x4}{1x1x3}\) =\(\frac{8}{3}\)
b)\(\frac{5x7x26}{14x13x25}\) = \(\frac{1x1x2}{2x1x5}\) =\(\frac{1x1x1}{1x1x5}\) = \(\frac{1}{5}\)
a)\(\frac{8}{13}+\frac{4}{9}+\frac{1}{3}+\frac{5}{13}+3\)
\(=\left(\frac{8}{13}+\frac{5}{13}\right)+\left(\frac{4}{9}+\frac{1}{3}\right)+3\)
\(=1+\left(\frac{4}{9}+\frac{3}{9}\right)+3\)
\(=1+\frac{7}{9}+3\)
\(=1+3+\frac{7}{9}\)
\(=4\frac{7}{9}\)
\(=\frac{43}{9}\)
b)\(\frac{8}{5}\cdot\frac{4}{7}+\frac{4}{7}\cdot\frac{2}{5}-1\)
\(=\frac{4}{7}\cdot\left(\frac{8}{5}+\frac{2}{5}\right)-1\)
\(=\frac{4}{7}\cdot2-1\)
\(=\frac{8}{7}-1\)
\(=\frac{1}{7}\)
a) \(\frac{8}{13}+\frac{4}{9}+\frac{1}{3}+\frac{5}{13}+3\)
\(=\left(\frac{8}{13}+\frac{5}{13}\right)+\left(\frac{4}{9}+\frac{3}{9}\right)+3\)
\(=1+\frac{7}{9}+3=4\frac{7}{9}\)
b)\(\frac{8}{5}.\frac{4}{7}+\frac{4}{7}.\frac{2}{5}-1\)
\(=\frac{4}{7}.\left(\frac{8}{5}+\frac{2}{5}\right)-1\)
\(=\frac{4}{7}.2-1\)
\(=\frac{8}{7}-\frac{7}{7}=\frac{1}{7}\)
chắc đề là như vậy: \(\frac{5x}{x-13}=21,25\)
=> \(21,23\left(x-13\right)=5x\)
=> \(21,23x-275,99=5x\)
=> \(21,23x-5x=275,99\)
=> \(16,23x=275,99\Rightarrow x=\frac{275,99}{16,23}=...\)