92 + 71 + 108 = (92 + 108) + 71 = 200 + 71 = 271

32 x 47 + 53 x 47 + 47 x 15 = 47(32 + 53 + 15)

                                         = 47.100

                                         = 4700

90 x 143 - 43 x 90 = 90.(143 - 43) = 90.100 = 9000

(1200 + 60) : 12 = 1800 : 12 = 150

2 x 18 x 24 + 3 x 50 x 16 + 12 x 32 x 4 = 18.(2.24) + 50.(3.16) + 32.(12.4) = 18.48 + 50.48 + 32.48 = 48(18 + 50 + 32) = 48.100 = 4800

92+71+108=71+92+108=71+200=271

92+71+108=71+(92+108)=71+200=271

90x143-43x90=90x(143-43)=90x100=9000

32x47+53x47+47x15=47x(32+53+15)=47x100=4700

(1200+60):12=1260:12=105

2x18x24+3x50x16+12x32x4=(2x24)x18+(3x16)x50+(12x4)x32

=48x18+48x50+48x32

=48x(18+50+32)

=48x100=4800

a) 29.(85-47)+85.(47-29)= 29.85-29.47+85.47-85.29
                                   =(29.85-85.29) -29.47+85.47
                                   =0-29.47+85.47
                                   = -29.47+85.47
                                   = (-29+85).47
                                   =56.47
                                   = 2632     
b)47.(23+50)-23.(47+50)= 47.23+47.50-23.47+23.50
                                  =(47.23-23.47)+47.50+23.50
                                  =0+47.50+23.50
                                  =47.50+23.50       
                                  =(47+23).50
                                  =70.50
                                  =3500
tích ^.^ ~

a) 29.(85-47)+85(47-29)

=29.38+85.18

=1102+1520

=2622

b)47.(23+50)-23.(47+50)

=47.73-23.97

=3431-2231

=1200

k mình nha...^_^...kb nữa... thanks

\(\frac{31}{47}.\frac{14}{29}+\frac{31}{47}.\frac{15}{29}+\frac{16}{47}=\frac{31}{47}(\frac{14}{29}+\frac{15}{29})+\frac{16}{47}=\frac{31}{47}+\frac{16}{47}\)

=1

-29.(85-47) - 85.(47-29)

= -29.85 + 29.47 - 85.47 + 85.29

= ( -29.85 + 85.29) + 29.47-85.47

= 0 + 47.(29-85)

= 47.(-56)

= -2632

- 29 . ( 85 - 47 )  -  85 . ( 47 - 29 )

= - 29 . 85 + 29 . 47 - 85 . 47 + 85 . 29

= ( - 29 . 85 + 85 . 29 ) + 29 . 47 - 85 . 47

= 0 + 47 . ( 29 - 85 )

= 47 . ( - 56 )

= - 2632

a/-2632

b/-232

c/16

Đ/s : 0

k cho t đi hà crazy

nguyen vt ha la con cho cua cong san

29(85 - 47) + 85(47 - 29)

= 29.85 - 29.47 + 85.47 - 85.29

= (29.85 - 85.29) - (29 . 47 - 85.47)

= - 47.(29 - 85)

= -47.(-56 ) = 2632

29( 85 - 47 ) + 85( 47 - 29 )

= 29 . 85 - 29 . 47 + 85 . 47 - 85 .29

= -29 . 47 + 85 . 47

= 47(- 29 + 85 )

= 47 . 56 = 3136

\(29(85-47)+85(47-29)\)

\(=29\cdot85-29\cdot47+85\cdot47-85\cdot29\)

\(=(29\cdot85-85\cdot29)-(29\cdot47-85\cdot47)\)

\(=0-\left[29-85\right]\cdot47=0-(-2536)=2536\)

  (-29).(85-47)-85.(47-29)

=(-29).38-85.18

=-1102-1530

=-2632

cam on ban nh a :>