35 x 12 + 65 x 13 

= 35 x 12 + 65 x ( 12 + 1 )

= 35 x 12 + 65 x 12 + 65 x 1

= 12 x ( 35 + 65 ) + 65 

= 12 x 100 + 65 

= 1200 + 65 

=1265

   35 . 12 + 65 . 13 

= 35 . 12 + 65 . (12 + 1 )

= 35 . 12 + 35 .12 + 65 

= ( 35 + 65 ) . 12 + 65 = 1200 + 65 = 1265

136×68+16×272= 136×68+16×2×136

                             = 136×68+32×136

                             =136×(68+32)

                             =136×100=13600

  35×12+65×13  = 35×12+65×(12+1)

                             = 35×12+65×12+65

                             =12×(35+65)+65

                             =12×100+65

                             =1200+65=1265

a) = 35 x 12 + 65 x 12 + 65 = (35 + 65) x 12+ 65 = 100 x 12 + 65 = 1200 + 65 = 1265

b)  (2 + 4 + 6 + ...+ 100) x ( 36 x 3 x 111 - 36 x 3 x 111) =  (2 + 4 + 6 + ...+ 100) x 0 = 0 

35x12+65x13=1265

(2+4+6+.....100) x(36x333-108x111)=0

a) = 35 x 12 + 65 x 12 + 65 = (35 + 65) x 12+ 65 = 100 x 12 + 65 = 1200 + 65 = 1265

 b) tuong tu a

b)  (2 + 4 + 6 + ...+ 100) x ( 36 x 3 x 111 - 36 x 3 x 111) =  (2 + 4 + 6 + ...+ 100) x 0 = 0 

\(19.64+76.34\)

\(=19.64+19.4.34\)

\(=19.64+19.136\)

\(=19.\left(64+136\right)\)

\(=19.200\)

\(=3800\)

\(35.12+65.13\)

\(=5.7.12+5.13.13\)

\(=5.84+5.169\)

\(=5.\left(84+169\right)\)

\(=5.253\)

\(=1265\)

\(19991999.1998-19981998.1999\)

\(=1999.10101.1998-1998.10101.1999\)

\(=0\)

\(\left(2+4+6+......+100\right).\left(36.333-108.111\right)\)

\(=\left(2+4+6+........+100\right).\left(36.3.111-108.111\right)\)

\(=\left(2+4+6+........+100\right).\left(108.111-108.111\right)\)

\(=\left(2+4+6+.......+100\right).0\)

\(=0\)

19x64+76x34

=19x64+19x4x34

=19x(64+136)

=19x200=3800

35x12+65x13

=5x7x12+5x13x13

=5x(7x12+13x13)

=5x253=1265

19991999x1998-19981998x1999

=1999x10001x1999-1998x10001x1999

=0

( 2+4+6+... +100) x ( 36x 333 -108 x111)

=(2+4+6+...+100)x(36x111x3-36x3x111)

=(..................tự điền, như trên thôi)x0=0

a, 19 x 64 + 76 x 34
= 19 x 2 x 32 + 38 x 2 x 34
= 38 x 32 + 38 x 68
= 38 x ( 32 + 68 )
= 38 x 100
= 3800
b, 35 x 12 + 65 x 13
= 35 x 12 + 65 x 12 + 65
= ( 35 + 65 ) x 12 + 65
= 100 x 12 + 65 
= 1200 + 65 
= 1265
d, ( 2 + 4 + 6 + ... + 1000) x ( 36 x 333 - 108 x 111 )
= ( 2 + 4 + 6 + ... + 1000 ) x ( 36 x 3 x 111 - 108 x 111)
= ( 2 + 4 + 6 + ...+ 1000 ) x ( 108 x 111 - 108 x 111 )
= ( 2 + 4 + 6 + ... + 1000 ) x 0
=  0
Câu c chịu

a)19 x 64 + 76 x 34

=> 3800

b) 35 x 12 + 65 x 13

=> 1265

c. 135 x 68 + 16 x 272 

=>(135 + 68) x (16 x 272)

=>135132