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\(\dfrac{2}{3}\times\dfrac{3}{4}\times\dfrac{4}{5}\) \(=\dfrac{2\times3\times4}{3\times4\times5}\) \(=\) \(\dfrac{2}{5}\)
\(25\times12\times30\times4\)
= \(\left(25\times4\right)\times\left(12\times30\right)\)
= \(100\times360\)
= \(36000\)
\(\frac{3}{4}.\frac{8}{9}.\frac{15}{16}.\frac{24}{25}.\frac{35}{36}\)
\(=\frac{3.2.4.3.5.4.6.5.7}{2.2.3.3.4.4.5.5.6.6}=\frac{7}{2.6}\)
\(=\frac{7}{12}\)
\(=\frac{1\cdot3\cdot2\cdot4\cdot3\cdot5\cdot4\cdot6\cdot5\cdot7}{2\cdot2\cdot3\cdot3\cdot4\cdot4\cdot5\cdot5\cdot6\cdot6}\)
\(=\frac{1\cdot7}{2\cdot6}\)
\(=\frac{7}{12}\)
625 : 25 + 375 : 25
= 625 . 1/25 + 375 . 1/25
= 1/25 (625 + 375)
= 1/25 . 1000
= 40
25 x 35 x 4 x 6
= (25 x 4 ) x ( 35 x 6 )
= 100 x 210
= 21 000
\(25\times35\times4\times6\)
\(=\left(25\times4\right)\times\left(35\times6\right)\)
\(=100\times210\)
\(=21000\)
\(25\times35\times4\times6\)
\(=\left(25\times4\right)\times\left(35\times6\right)\)
\(=100\times210\)
\(=21000\)
\(~HT~\)
120 x 64 + 320 - 25 x 4 x 16
= ( 120 x 64) + 320 - (25 x 4 x 16)
= 7680 + 320 - ( 100 x 16 )
= 8000 - 1600
= 6400
25x6x4
=25x24
=600
25*4=100*6=600