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 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

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

= (36+64) x 110

= 100 x 110

= 11000

b) 36 nhan ( 28+82) + 64 nhan ( 69 + 41)

= 36. 110 + 64 . 110

= 110 . ( 36 + 64 )

= 110 .100

=11000

Máy tính

36.28+36.82+64.69+64.41=36.(28+82)+64(69+41)=36.110+64.110=110.(36+64)=110.100=110000

a) 45 x 76 + 90 x 12

= 45 x 76 + 45 x 2 x 12

= 45 x 76 + 45 x 24

= 45 x ( 76 + 24 ) 

= 45 x 100

= 4500

b) 2 x 31 x 12 + 4 x 6 x 69

= 24 x 31 + 24 x 69

= 24 x ( 31 + 69 )

= 24 x 100

= 2400

c) 36 x 28 + 36 x 82 + 64 x 69 + 64 x41

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

= 36 x 110 + 64 x 110

= 110 x ( 36 + 64 )

= 110 x 100

= 11 000

d) 156 ( x + 61)  = 82

=> x + 61 = \(\frac{82}{156}\)

=> x + 61 = \(\frac{41}{78}\)

=> x = \(\frac{41}{78}\)- 61

=> x = \(\frac{-4717}{78}\)

45 x 76 + 90 x 12 = 45 x 76 + 45 x 2 x 12

= 45 x 76 + 45 x 24

= 45 x (76 + 24)

= 45 x 100 

= 4500

b) 2 x 31 x 12 + 4 x  6 x 69 = 62 x 12 + 2 x 12 x 69

= 62 x 12 + 138 x 12

= (62 + 138) x 12

= 200 x 12 = 2400

a, 45 x 76 + 90 x 12

= ( 45 x 12 ) + ( 76 x 90 )

=  540     +   6840

=     7 380

c,

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

= 36 x  110    +   64 x 110

= 110 x ( 36 + 64 )

= 110 x 100

= 11000

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

=36x110+64x110

=110x(26+64)

=110x100

=11000

**** bn hiền

36x28+36x82+64x69+64x41

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

=36x110+64x110

=110x(36+64)

=110x100

=11000

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

a)73.(49+51)=73.100=7300

a) 73 x 49 + 73 x 51          b) 22344 x 36 + 44688 x 82         c) 3 x 18 x 12 + 4 x 82 x 9        d) 36 x 28 + 36 x 82 +64 x 69 + 64 x 41

= 73 x (49 + 51)                 =804384 + 3664416                   = 648 + 2952                            = 36 x (28 + 82) + 64 x (69 + 41)

=73 x 100                          =4468800                                 = 3600                                      = 36 x 110 + 64 110

=7300                                                                                                                               = 110 x (36 x 64)

                                                                                                                                        = 110 x 100

                                                                                                                                        = 11000

Tính nhanh: 

36 x 28 + 4 x 9 x 82 + 64 x 69 + 8 x 41 x 8

= 36 x 28 + ( 4 x 9 ) x 82 + 64 x 69 + ( 8 x 8 ) x 41

= 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

^^ Học tốt nhé!  

đáp án là 11000

    36 x 28 + 4 x 9 x 82 + 64 x 69 + 8 x 41 x 8

 = 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