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\(\dfrac{240.50+48.100}{42.37+21.126}\)
\(=\dfrac{24.5.10.10+48.100}{42.37+3.7.6.21}\)
\(=\dfrac{100.100+48.100}{42.37+42.63}\)
\(=\dfrac{100.\left(100+48\right)}{42.\left(37+63\right)}\)
\(=\dfrac{100.148}{42.100}\)
\(=\dfrac{148}{42}\)
\(=\dfrac{74}{21}\)
240 x 50 + 96 x 50 : 32 x 37 + 84 x 32
= { 240 + 96 } x 50 : { 37 + 84 ] x 32
= 336 x 50 : 121 x 32
=16800 : 3872
=4,33884297520612
Ta có: \(240\times50+48\times100\)
\(=48\times50\times5+48\times50\times2\)
\(=48\times50\times\left(5+2\right)=48\times50\times7\)
\(42\times37+21\times12\)
\(=21\times2\times37+21\times12\)
=21x(74+12)
=21x86
Ta có: \(\frac{240\times50+48\times100}{42\times37+21\times12}\)
\(=\frac{48\times50\times7}{21\times86}=\frac{7\times3}{21}\times\frac{16\times50}{86}=16\times\frac{25}{43}=\frac{400}{43}\)
a)\(8-\frac{3}{5}=\frac{40}{5}-\frac{3}{5}=\frac{37}{5}\)
b)\(\frac{24}{15}\times\frac{56}{72}\times\frac{10}{14}=\frac{13440}{15120}=\frac{8}{9}\)
c)\(\frac{32}{48}\times\frac{35}{21}\times\frac{63}{14}\times\frac{9}{30}=\frac{2}{3}\times\frac{5}{3}\times\frac{9}{2}\times\frac{3}{10}=\frac{270}{180}=\frac{3}{2}\)
d)\(7-\frac{72}{48}\times\frac{56}{60}-3=7-\frac{3}{2}\times\frac{14}{15}-3\)
\(=7-\frac{7}{5}-3\)
\(=\frac{35}{5}-\frac{7}{5}-\frac{15}{5}\)
\(=\frac{13}{5}\)
#H
(Sai thì sửa)
\(=\dfrac{12000+4800}{42\left(37+63\right)}=\dfrac{16800}{42\cdot100}=\dfrac{168}{42}=4\)