Question

19x27+47x81+19x20 

mẫu :35x23+35+41+64x65

=35x(23+41)+64x65

=35x64+64x65

64x(35+65)

=64x100

=6400

Answer 1

19×27+47×81+19×20

=19×(27+20)+47×81

=19×47+47×81

=47×(19+81)

=47×100

=4700.

Answer 2

19x27+47x81+19x20

=19x27+19x20+47x81

=19x(27+20)+47x81

=19x   47      +47x81

=19x   47      +81x47

=(19+81)x47

=   100   x47

=       4700.

K nhé bạn ơi.