=13h 28 phút

13 giờ 28 phút

\(785+677+215+123=\left(785+215\right)+\left(677+123\right)=1000+800=1800\)

=(785+215)+(677+123)

=1000+800=1800

=(785+215)+(677+123)

=1000+800

=1800

325+6,8+675+3,2=(6,8+3,2)+675+325

                             =10+1000

39/17

39/17

  12/17 + 19/17 + 8/17

=         31/17 + 8/17

=            39/17

Vậy.... [kết luận]

\(38\times8+27\times2\)

\(=\left(38\times8\right)+\left(27\times2\right)\)

\(=304+54\)

\(=358\)

$38\times 8+27\times 2$

$=\left(38\times 8\right)+\left(27\times 2\right)$

$=304+54$

$=358$

38 x 8 + 27 x 2

= 38 x 4 x 2 + 27 x 2

= 152 x 2 + 27 x 2

= 2 x (152 + 27)

= 2 x 179

= 358

\(0,127\times3+0,127\times6+0,127\)

\(=0,127\times3+0,127\times6+0,127\times1\)

\(=0,127\times\left(3+6+1\right)\)

\(=0,127\times10\)

\(=1,27\)

= 0,127 x 3 + 0,127 x 6 + 0,127

= 0,127 x ( 3 + 6 + 1 )

= 0,127 x 10

= 1,27

0,127.3+0,127.6 +0,127

=0,127.(3+6)+0,127

0,127-0,127

=1

0,127.(9+1)

0,127.10

1,27

  2,15 x 23,06 + 2,15 x 76,94 + 17,85

=2,15 x ( 23,06 + 76,94 ) + 17,85

=2,15 x 100 + 17,85

=215 + 17,85

=232,85

2.15 * 23.06 + 2.15 * 76.94 + 17.85

2.15 *[23.06+76.94+17.85]

2.15 *117.85

253.3775

2,15 x 23,06 + 2,15 x 76,94 + 17,85 

= 2,15 x ( 23,06 + 76,94 ) + 17,85 

= 2,15 x 100 + 17,85

= 215 + 17,85

= 232,85