214*6+3*214+214*2-214

=214*(6+3+2-1)

=214*10

=2140

~HT~ (Kick cho mik nha!!!)

214 x 6 + 3 x 214 + 214 x 2 - 214

214 x ( 6 + 3 + 2 - 1 )

214 x 10

2140

214 x(6 + 3) +428-214

214 x 9 + 214

1928 + 214

2142

a: =142*100=14200

b: =436*9-214*100=-17476

c: =78*123=9594

d: =0*A=0

\(745\times214+254\times214+214\)

\(=214\times745+214\times254+214\times1\)

\(=214\times\left(745+254+1\right)\)

\(=214\times1000\)

\(=214000\)

= 745 x 214 + 254 x 214 + 214 x1

= 214 x ( 745 + 254 + 1)

= 214 x 1000

= 214000

745 x 214 + 254 x 214 + 214 x 1

214 x (745 + 254 + 1 )

214 x 1000

214000

(-37).214 + 214.(-63)

= 214. [(-37) + (-63)]

= 214. (-100)

= -21400

(-37).214 + 214.(-63)

= 214.(-37 - 63)

= 214.(-100)

= -21400

= 214x(13+17)

=214x 30

=6420

214 x 13 + 214 x 17 = 214 x (13 + 17) = 214 x 30 = 6420

214 x 13 + 214 x 17

=214 x (13+17)

=214 x30

=6420

a) \(4\times378\times25\)

\(=\left(25\times4\right)\times378\)

\(=100\times378\)

\(=37800\)

b) \(214\times53-214\times45\)

\(=214\times\left(53-45\right)\)

\(=214\times8\)

\(=1712\)

a) \(4\times378\times25\)

\(=4\times25\times378\)

\(=100\times378\)

\(=37800\)

b) \(214\times53-214\times45\)

\(=214\times\left(53-45\right)\)

\(=214\times8\)

\(=1712\) _{( Thuận tiện chỗ nào? )}

a} 37800

b| 1712

a: =214*(13+17)=214*30=6420

b: =635(58-48)=635*10=6350

c: =100*19=1900

d: =4*32=128

64200 

45360

38090

3

3

57

= 64200 

= 45360

= 38090

= 3

= 3

= 57

64200 

45360

38090

3

3

57

a)214+[120-(214+120)]=214+120-214-120=(214-214)+(120-120)=0+0=0

b)(-321)-[(-321+35)-235]=(-321)+321-35+235=(-321+321)-(35-235)=0-(-200)=200