327 - 16 + 216 - 27 + 600          16 x 48 + 8 x 48 + 16 x 28

=(327 - 27) + (216 - 16) + 600      =16 x 48 + 16 x 24 + 16 x 28 

=300           + 200           + 600     =16 x (48 + 24 + 28)

=500                               + 600     =16 x 100

=1100                                            =1600

A) 137/ 12

B) 4

C) 5

b, 3/5 + 4/7 + 2/8 + 10/25 + 9/21 + 28/16

= 3/5 + 4/7 + 2/8 + 2/5 + 3/7 + 14/8

= (3/5 + 2/5) + ( 4/7 + 3/7) + ( 2/8 + 14/8)

= 1 + 1 + 7/4

= 2 + 7/4 = 15/4

c , 8/7 + 7/6 + 5/8 + 10/12 + 24/28 + 6/16 

= c , 8/7 + 7/6 + 5/8 + 5/6 + 6/7 + 1/2

= (8/7 + 6/7) + (7/6 + 5/6) + 5/8 + 1/2

= 14/7 + 12/6 + 5/8 + 1/2

= 2 + 2 + 5/8 + 1/2

= 4 + 9/8 = 41/8

Tính nhanh :

\(a.1+2+3+...+98+99+100\)

\(=\left(100+1\right).100:2\)

\(=101.100:2\)

\(=10100:2\)

\(=5050\)

\(b.16.48+8.48+16.28\)

\(=48.\left(16+8\right)+16.28\)

\(=48.24+16.28\)

\(=1152+448\)

\(=1600\)

16.48+8.48+16.28 

 = 16.48+8.16.3+16.28

 = 16.48+24.16+16.28

 = 16.(48+24+28)

 = 16. 100

 = 1600

16x48 +8x48+16x48

=(16+8+16)x48

=40x48

=1920

A = \(\dfrac{8\times12\times32+4\times27\times24+96\times41}{16\times48-48\times9+4\times3\times12}\)

A = \(\dfrac{96\times32+96\times27+96\times41}{16\times48-48\times9+48\times3}\)

A = \(\dfrac{96\times\left(32+27+41\right)}{48\times\left(16-9+3\right)}\)

A = \(\dfrac{96\times100}{48\times10}\)

A = \(\dfrac{20}{1}\) \(\times\) \(\dfrac{48\times10}{48\times10}\)

A = 20 

1000 - 47 . 72 - 47 .28

= 47 . ( 1000 - 72 -28 )

= 47 .0

=0

3457 - 27 . 48 - 48 .73 + 6543

=3457 - 48 . (27 + 73 ) + 6543

= 3457 - 4800 + 6543

= 5200