19*64+76*34

=19*64+19*4*34

=19*64+16*136

=19*(136+64)

=19*200

=3800

19*64+76*34=19*64+19*4*34 =19 * 64+1 6* 136 =19* (136 + 64) = 19 * 200 =3800

19x64-76x34=-1368

136x68+16x272=13600

ung ho nha

chỉ mình đánh dấu nhân đi

19.64+76.34

=19.4.16+76.34

=76.16+76.34

=76.(16+34)

=76.50

3800

= 3800

a Ta có

(1+2+3....+100).(1^2+2^2+..+10^2).(13.5.3.37-13.15.37)

=(1+2...+100).(1^2+2^2+...+10^2).0=0

b Ta co

19.64+76.34=19.4.16+76.34=76.16+76.34=76(16+34)=76.50=3100 ( cau c tuong tu )

\(19.64+76.34\)

\(=19.64+19.4.34\)

\(=19.64+19.136\)

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

\(=19.200\)

\(=3800\)

\(35.12+65.13\)

\(=5.7.12+5.13.13\)

\(=5.84+5.169\)

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

\(=5.253\)

\(=1265\)

\(19991999.1998-19981998.1999\)

\(=1999.10101.1998-1998.10101.1999\)

\(=0\)

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

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

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

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

\(=0\)

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

19x64+76x34

=19x4x16+76x34

=76x16+76x34

=76x(16+34)=76x50=3800

*19x64+76x34=

19x64x19x4x34

19x64x19x136

19x(64+136)

19x200

3800

* 136x68+16x272=

    136x68+16x2x136

     136x68+32x136

      136x(68+136)

       136x200

        27200

                                                                         Giải

                                                  19 x 64 + 76 x 34 = 19 x 64

                                                                               = 1216

                                                                               = 1216 + ( 76 x 34 )

                                                                               = 1216 + 2584

                                                                               = 3800.