Question

53x39+47x39-53x21-47x21

Answer 1

53x39+47x39-53x21-47x21

=39x(53+47)-21x(53+47)

=39x100-21x100

=100x(39-21)

=100x18

=1800

Answer 2

= 39 x ( 53+47) - ( 21 ( 53 +47) khi bạn bỏ ngoặc vào phải đỏi dấu nhé:

 = 3900-2100=1800.tck nha

Answer 3

\(=3900-2100=1800\)

Answer 4

53x39+47x39-53x21-47x21

=39x[53+47]-21x[53-47]

=39x100-21x6

=3900-126

=3774

Answer 5

\(\left(53\cdot39-53\cdot21\right)-\left(47\cdot39-47\cdot21\right)\)

\(53\cdot18-47\cdot18\)

\(1800\)

Answer 6

tetvuive,bạn làm sai rùi