Question

tinh nhanh 78.31+22.72+78.24+78.17

Answer 1

78.31+22.72+78.24+78.17

=78.(31+24+17)+22.72

=78.72+22.72

=(78+22).72

=100.72

=7200

Answer 2

78.31+22.72+78.24+78.17

=78.(31+24+17)+22.72

=78.72+22.72

=(78+22).72

=100.72

=7200

Answer 3

78.31+22.72+78.24+78.17

=78.(31+24+17)+22.72

=78.72+22.72

=(78+22).72

=100.72

=7200

Answer 4

78.31+22.72+78.24+78.17

=78.(31+24+17)+22.72

=78.72+22.72

=(78+22).72

=100.72

=7200

Answer 5

78 . 31 + 22 . 72 + 78 . 24 + 78 . 17

= 78 . ( 31 + 24 + 17 ) + 22 . 72

= 78 . 72 + 22 . 72

= 72 . ( 78 + 22 )

= 72 . 100

= 7200

Answer 6

78 . 31 + 22 . 72 + 78 . 24 + 78 . 17

= 78 . ( 31 + 24 + 17 ) + 22 . 72

= 78 . 72 + 22 . 72

= 72 . ( 78 + 22 )

= 72 . 100

= 7200

Answer 7

78 . 31 + 22 . 72 + 78 . 24 + 78 . 17

= 78 . ( 31 + 24 + 17 ) + 22 . 72

= 78 . 72 + 22 . 72

= 72 . ( 78 + 22 )

= 72 . 100

= 7200

Answer 8

78 . 31 + 22 . 72 + 78 . 24 + 78 . 17

= 78 . ( 31 + 24 + 17 ) + 22 . 72

= 78 . 72 + 22 . 72

= 72 . ( 78 + 22 )

= 72 . 100

= 7200

Answer 9

  78.31+22.72+78.24+78.17

=78.(31+24+17)+22.72

=78.72+22.72

=72.(78+22)

=72.100

=7200