mik đầu tiên nhé bạn !

a) 2.31.12+4.6.42+8.27.3

=24.31+24.42+24.27

=24.(31+42+27)

=24.100

=2400

b) 36.28+36.82+64.69+64.41

=36.(28+82)+64.(69+41)

=36.110+64.110

=110.(36+64)

=110.100

=11000

a) 2 . 31 . 12 + 4 . 6 . 42 + 8 . 27 . 3

= 24 . 31 + 24 . 42 + 24 . 27

= 24 . (31 + 42 + 27)

= 24 . 100

= 2400

b) 36 . 28 + 36 . 82 + 64 . 69 + 64 . 41

= 36 . (28 + 82) + 64 . (69 + 41)

= 36 . 110 + 64 . 110

= (36 + 64) . 110

= 100 . 110

= 11000

a) 2400

b)11000

a) 2.31.12+4.6.42+8.27.3

=24.31+24.42+24.27

=24.(31+42+27)

=24.100

=2400

b) 36.28+36.82+64.69+64.41

=36.(28+82)+64.(69+41)

=36.110+64.110

=110.(36+64)

=110.100

=11000

a = 24 . 31 + 24 . 42 + 24 . 27

= 24 . 100

= 2400

b = 36 . ( 28 + 82 ) + 64 . ( 69 + 41 )

= 36 . 110 + 64 . 110

= 110 . ( 36 + 64 )

= 100 . 100 = 11000

a = 24 . 31 + 24 . 42 + 24 . 27

= 24 . 100 

= 2400

b = 36 . ( 28 + 82 ) + 64 . ( 69 + 41 )

= 36 . 110 + 64 . 110

= 110 . ( 36 + 64 )

= 110 . 100 = 11000

a) A = 2.31.12 + 4.6.42 + 8.27.3

= 24.31 + 24.42 + 24.27

= 24.(31 + 42 + 27)

= 24.100 = 2400

b) B = 36.28 + 36.82 + 64.69 + 64.41

= 36.(28 + 82) + 64.(69 + 41)

= 36.110 + 64.110

= 110.(36 + 64)

= 110.100 

= 11000

a,  2 . 31 . 12 + 4 . 6 . 42 + 8 . 27 . 3 

= 24 . 31 + 24 . 42 + 24 . 27

= 24 . ( 31 + 42 + 27 )

=  24 . 100 = 2400

b, 36 . 28 + 36 . 82 + 64 . 69 + 64 . 41

= 36 . ( 28 + 82 ) + 64 . ( 69 + 41 ) 

= 36 . 110 +  64 . 110 

= 110 . ( 36 + 64 ) 

= 110 . 100 = 11000 

a) 2.31.12+4.6.42+8.27.3

= [(2.12).31]+[(4.6).42]+[(8.3).27]

= 24.31+24.42+24.27

= 24.(31+42+27)

= 24.100

= 2400

b) 36.28+36.82+64.69+64.41

= (36.28+36.82)+(64.69+64.41)

= [36.(28+82)]+[64.(69+41]

= 36.110+54.110

= 110.(36+54)

= 110.90

= 200

a) 2 . 31 .12 + 4 .6 .42 + 8 .27 .3

= 2 .12 .31 + 4 . 6 .42 + 8 . 3 .27

= 24 . 12 + 24 . 42 + 24 . 27

= 24 . ( 12 + 42 + 27 )

= 24 .  86

= 2064

b) 36 . 28 + 36 . 82 + 64 . 69 + 64 . 41

= 36. ( 28 + 82 ) + 64 . ( 69 + 41 )

= 36 . 110 + 64 . 110

=  ( 36 + 64 ) . 110

= 100 . 110

= 11000

tính nhanh 

a) 2 . 31 . 12 + 4 . 6 . 42 + 8 . 27 . 3

b) 36 . 28 + 36 . 82 + 64 . 69 + 64 . 41

a) 2.31.12+4.6.42+8.27.3

= [(2.12).31]+[(4.6).42]+[(8.3).27]

= 24.31+24.42+24.27

= 24.(31+42+27)

= 24.100

= 2400

b) 36.28+36.82+64.69+64.41

= (36.28+36.82)+(64.69+64.41)

= [36.(28+82)]+[64.(69+41]

= 36.110+54.110

= 110.(36+54)

= 110.90

= 200

b) 36.28+36.82+64.69+64.41

= 36.(28+82)+64.(69+41)

=36.110+64.110

=(36+64).110

=100.110

=11000.( phần a mk nghĩ sau )

b) = 36 . (28+82) + 64 . (69+41)

    = 36 . 110 + 64 . 110

    = (36+64) . 110

    = 100 . 110

    = 11000

a, 2 . 31 . 12 + 4 . 6 . 42 + 8 . 27 . 3

= 2 . 31 . 3 . 4 + 4 . 2 .3 . 42 + 2 . 4 . 27 . 3

= 2 . 3 . 4 ( 31 + 42 + 27 )

= 2 . 3 . 4 . 110

= 2640

a) 2 x 31 x 12 + 4 x 6 x 42 + 8 x 27 x 3

= 24 x 31 + 24 x 42 + 24 x 27

= 21 x ( 31 + 42 + 27)

= 21 x 100

= 2100

b) 36 x 28 + 36 x 82 + 64 x 69 + 64 x 41

= 36 x ( 28 + 82) + 64 x ( 69 + 41)

= 36 x 110 + 64 x 110 

= 110 x ( 36 + 64)

= 110 x 100

= 11000

a)2 x 31 x12 + 4 x 6 x 42 + 8 x 27 x 3

= 24 x 31 + 24 x 42 + 24 x 27

= 24 x (31 + 24 + 27)

=24 x 82

=1968

b)36 x 28 + 36 x 82 + 64 x 69 + 64 x 41

=36 x (28 + 82) + 64 x ( 69 + 41 )

=36 x 110 + 64 x 110

=3960 + 7040

=11000

a) 2x31x12+4x6x42+8x27x3

=2x12x31+4x6x42+8x3x27

=24x31+24x42+24x27

=24x(31+42+27)

24x100=2400

b)36x28+36x82+64x69+64x41

=36x(28+82)+64x(69+41)

=36x110+64x110

2 x 31 x 12+ 4 x 6 x 42 + 8 x 3 x 27 = 24 x 31 + 24 x 42 + 24 x 27 = 24 x (27 + 31 + 42) = 24 x 100 = 2400

b) 36 x 28 + 36 x 82 + 64 x 69 + 64 x 41 = 36 x (28 + 82)  + 64 x (69 + 41) = 36 x 110 + 64 x 110 = 110 x (64 + 36) = 110 x 100 = 11000

a.2.31.12+4.6.42+8.27.3

=2.12.31+4.6.42+8.3.27

=24.31+24.42+24.27

=24.(31+42+27)

=24.100

=2400

b.36.28+36.83+64.69+64.41

=36.(28+83)+64.(69+41)

=36.111+64.111

=(36+64).111

=100.111

=11100