a) 86 + 357 + 14                    b) 72 + 69 + 128                          c) 25.5.4.27.2                            d) 28.64 + 28.36

= (86 + 14) + 357                   = (72 + 128) + 69                          = (25.4).(5.2).27                        = 28.(36+64)

= 100 + 357                          = 200 + 69                                    = 100.10.27                              = 28.100

= 457                                   = 269                                           = 1000.27 = 27000                     = 2800

a,86+357+14=[86+14]+357      

                =100+357

                =457

 b,72+69+128=[72+128]+69

                   =200+69

                   =269

c,25.5.4.27.2=[25.4].[5.2].27

                  =100.10.27

                  =1000.27

                  =27000

d,28.64+28.36=28.[64+36]

                     =28.100

                     =2800

a) 86 + 357 + 14 = (86 + 14) + 357

= 100  + 357

= 457

b) 25 . 13 . 4 = (25 . 4) . 13

= 100 . 13

= 1300

c) 28 . 64 + 28 . 36  = 28 . (64 + 36)

= 28 . 100

=2800

a) 86 + 357 + 14

= ( 86 + 14 ) + 357

= 100 + 537

= 637

b)25 . 13 . 4

= ( 25 . 4 ) . 13

= 100 . 13

= 1300

c) 28 . ( 64 + 36 )

= 28 . 100

= 2800

  a (86+14)+357=100+357=457

b 25.13.4=(25.4).13=100.13=1300

c 28.64+28.36=28.(64+36)=28.100=2800

a)86+357+14

=(86+14)+357

=100+357

=457.

b)72+69+128

=(72+128)+69

=200+69

=269.

c)25.5.4.27.2

=25.5.2.4.27

=25.5.8.27

=25.40.27

=1000.27

=27000.

d)28.64+28.36

=28.(64+36)

=28.100

=2800.

a, (86+14)+357

=100+357

=457

b,(72+128)+69

=200+69

=269

c,(25.4).(5.2).27

=100.10.27

=27000

d,28.(64+36)

=28.100

=2800

 28.64 + 28.36 = 28.(64+36) =28.100 =2800.

a) 86 + 357 + 14 = ( 86 + 14 ) + 357

                         =    100        + 357  = 457 

b) 72 + 69 + 128 = ( 72 + 128 ) + 69 

                         =      200        + 69  = 269 

c) 25 . 5 . 4 . 27 . 2 = ( 25 . 4 ) . ( 5 . 2 ) . 27

                             =    100     .     10    . 27 

                             =          1000           . 27 = 27000

d) 28 . 64 + 28 . 36 = 28 . ( 64 + 36 ) 

                             = 28 .      100 = 2800

Conan đúng rồi trình bày đẹp nữa chứ

a)86+357+14

=(86+14)+357

=100+357

=457

b)72+69+128

=(72+128)+69

=200+69

=269

c)25.5.4.27.2

=(25.4).(5.2).27

=100.10.27

=27 000

d)28.64+28.36

=28(64+36)

=28.100

=2800

a=457

b=269

d=57

còn câu C ko có phép tính nên mình ko làm

a) 86+357+14=(86+14)+357=100+357=457

b) 72+69+128=(72+128)+69=200+69=269

c) 25.5.4.27.2=(25.4).(5.2).27=100.10.27=27000

d) 28.64+28.36=28.(64+36)=28.100=2800

Tomoyo Daidouji à phép nhân á bạn . 25 nhân 5 nhân 4 nhân 27 nhân 2

86 +357 + 14 = (86 +14) + 357 = 100 + 357 = 457

72 + 69 + 128 = (72 +128) + 69 = 200 + 69 = 269

a) 86 + 357 + 14

= ( 86 + 14 ) + 357

= 100 + 357

= 457

b) 72 + 69 + 128

= ( 72 + 128 ) + 69

= 200 + 69

= 269

c) 25 . 5 . 4 . 27

= ( 25 . 4 ) . 5 . 27

= 100 . 5 . 27

= 500 . 27

= 13500

d) 28 . 64 + 28 . 36

= 28 . ( 64 + 36 )

= 28 . 100

= 2800

a)

\(86+357+14=\left(86+14\right)+357=100+357=457\)

b)

\(72+69+128=\left(72+128\right)+69=200+69=269\)

c)

\(25.5.4.27.2=\left(25.4\right).\left(5.2\right).27=100.10.27=27000\)

d)

\(28.64+28.36=28.\left(64+36\right)=28.100=2800\)

a) 86 + 357 + 14 = (86 + 14) + 357

                              =    100 + 357

                              =         457

b) 72 + 69 + 128 = (72 + 128) + 69

                              =    200 + 69

                              =         269

c) 25 . 5 . 4 . 27 . 2 = (25 . 4) . (5 . 2) . 27

                                 =   100 . 10 . 27

                                 =      1000 . 27

                                 =         27000

d) 28 . 64 + 28 . 36 = 28 . (64 + 36)

                                  = 28 . 100

                                  =    2800