13.75 + 13.25 -140 17 .131 + 69 .17 =

13.75 + 13.25 -140 17 .131 + 69 .17
=

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  1. ~ ( Chúc bạn học tốt ^^ ) ~

    a) 13.75 + 13.25 -140

    = 13. ( 75 + 25 ) – 140

    = 13 . 100 – 1,4 . 100

    = 100 . ( 13 – 1,4 )

    = 100 . 11,6

    = 1160

    b) 17 .131 + 69 .17

    = 17. ( 131 + 69 )

    = 17. 200

    = 17 . 2 . 100

    = 34 . 100

    = 3400

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