8x1=8

8x2=16

8x3=24

8x4=32

8x5=40

8x6=48

8x7=56

8x8=64

8x9=72

8x10=80

8 x 1 = 8

8 x 2 = 16

8 x 3 = 24

8 x 4 = 32

8 x 5 = 40 

8 x 6 = 48

8 x 7 = 56

8 x 8 = 64

8 x 9 = 72

8 x 10 = 80

8 x 8 = 64

8 x 9 = 72

8 x 7 = 56

8 x 6 = 48

8x1=8 

8x2=16

8x3=24

8x4=32

8x5=40

8x6=48

8x7=56

8x8=64

8x9=72

8x10=80

8x1=8

8x2=16

8x3=24

8x4=32

8x5=40

8x6=48

8x7=56

8x8=64

8x9=72

8x10=80

minh nhanh nhat k nha

( 1 + 2 + 3 + 4  .................... + 9 ) x ( 48 - 8 x6 )

= ( 1 + 2 + 3 + 4 ..............+ 9 ) x ( 48 - 48 )

=  ( 1 + 2 + 3 + 4 ............... + 9 ) x 0 

= 0

(1+2+3+4+...+9)x(48-8x6)=0

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May tinh la hop li thuan tien nhat nha bn

a) = 4x ( 12 + 1 ) +5

    = 4 x 13 + 5

     =  57

b)= (8x4 + 8x6) +8x 5

  =     8x 10       + 8x5

  =       80          +  40

  = 120 

c) = 2 + 3x2 + 4x2 + 3x2

     = 2 + ( 2 x 10 )

     =  2    + 20 

      =     22

100600000000069

Nhanh len nao ai nhanh nhat mk k

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