Question

Tính nhanh: 66 - 6 + 7 +23 - 18 + 2

Answer 1

66-6+7+23-18+2

= (66-6) + (7+23) - (18-2)

= (60 + 30) - 16

= 90 - 16

= 74

Answer 2

66 - 6 + 7 + 23 - 18 + 2

= 60 + 30 - 18 + 2

= 90 - 18 + 2

=72 + 2

= 74

Answer 3

66 - 6 + 7 +23 - 18 + 2 

= ( 66 - 6 ) + ( 7 + 23 ) - 18 +  2 

=     60      +      30 - 18 + 2

= 90 - 18 + 2 

= 90 + ( 18 - 2 )

= 90 + 16

= 106 

Answer 4

66-6+7+23-18+2

=(66-6)+(7+23)-(18+2)

=60+30+20

=90+20

=110

Answer 5

66-6+7+23+18+2

=(66-6) +( 7+23 ) +(18+2)

=60+30+20

= 90+20

=110

Answer 6

66 - 6 + 7 + 23 - 18 + 2

= ( 66 - 6 ) + ( 7+ 23 ) - ( 18 + 2 )

=      60     +     30      -      20

=              90              -     20

=                             70

Answer 7

74 nha

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