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) 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 

19x64-76x34=-1368

136x68+16x272=13600

ung ho nha

chỉ mình đánh dấu nhân đi

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

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

12784

1453

5700

179

10158

=  225.55 +  225.55

=  451.1 

a)\(65.3,47+3,47.65\)
\(=65.\left(3,47+3,47\right)\)
\(=65.6,94\)
\(=451,1\)

136 x 68 + 16 x 272

= 136 x 68 + 16 x 136 x 2

= 136 x (68 + 16 x 2)

= 136 x (68 + 32)

= 136 x 100

= 13600

Dễ mà bạn

136x68+16x272

=136x68+(16x2)x(272:2)

=136x68+32x136

=136x(68+32)

=136x100=13600