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25x14x4
=(25x4)x14
=100x14
=1400
15x19:5
=(15:5)x19
=3x19
=57
31x2x8x5
=(31x8)x(2x5)
=248x10
=2480
25 × 14 × 4 = (25 × 4 ) × 14
=100 × 14
= 1 400
15 × 19 : 5 = ( 15 : 5 ) × 19
= 3 × 19
= 57
31 × 2 × 8 × 5 = (31 × 8 ) × ( 2 × 5 )
= 248 × 10
= 2 480
\(108\times5+108\times96-108=108\times\left(5+96-1\right)\)
\(=108\times100=10800\)
206 x 8 x 5
= 206 x (8 x 5)
= 206 x 40
= 8240
@Nghệ Mạt
#cua
= 5 x 107 + 5 x 1 - 5 x 8/ 5 x 1
= 5 x ( 107+1-8)/ 5 x 1
= 5 x 100/5 x 1
= 1 x 100/ 5 x 1
= 100
\(\dfrac{5}{6}\times3+\dfrac{20}{6}\times2-1:\dfrac{6}{5}\)
\(=\dfrac{5}{6}\times3-\dfrac{5}{6}+\dfrac{20}{6}\times2\)
\(=\dfrac{5}{6}\times\left(3-1\right)+\dfrac{20}{6}\times2\)
\(=\dfrac{5}{6}\times2+\dfrac{20}{6}\times2\)
\(=\left(\dfrac{5}{6}+\dfrac{20}{6}\right)\times2\)
\(=\dfrac{25}{6}\times2\)
\(=\dfrac{25}{3}\)
#DatNe
\(\dfrac{5}{6}\) \(\times\) 3 + \(\dfrac{20}{6}\) \(\times\) 2 - 1 : \(\dfrac{6}{5}\)
= \(\dfrac{5}{6}\) \(\times\) 3 + \(\dfrac{20}{6}\) \(\times\) 2 - \(\dfrac{5}{6}\)
= \(\dfrac{5}{6}\) \(\times\) 3 + \(\dfrac{5}{6}\) \(\times\) 8 - \(\dfrac{5}{6}\) \(\times\)1
= \(\dfrac{5}{6}\) \(\times\) ( 3 + 8 - 1)
= \(\dfrac{5}{6}\) \(\times\)10
= \(\dfrac{25}{3}\)
15 x 19 : 5 = 15 : 5 x 19
= 3 x 19
= 57
= 15 : 5 x 19
= 3 x 19
= 57