? asked in 科學及數學數學 · 1 decade ago

分數 + 小數 數學題!!!THX=]

分數 + 小數 數學題

1) ( 8 - 5.4 ) ÷ 13 × 2

=????

=????

=????

2) ( 2 又 7 份 之 1 + 3 又 4 份 之 3 ) ÷ 5

=????

=????

Thank you~~~=]

3 Answers

Rating
  • Kelly
    Lv 6
    1 decade ago
    Favorite Answer

    1) ( 8 - 5.4 ) ÷ 13 × 2

    =2.6 ÷ 13 x 2

    =0.2 x 2

    =0.4

    2) ( 2 又 7 份 之 1 + 3 又 4 份 之 3 ) ÷ 5

    =(2 1/7 + 3 3/4) ÷ 5

    =(2 4/28 + 3 21/28) ÷5

    =5 25/28

    =165/28 x 1/5

    =33/28

    =1 5/28

  • 1 decade ago

    1) ( 8 - 5.4 ) ÷ 13 × 2

    =3.4 ÷ 13 × 2

    =1.4462(取小數4個位)

    2) ( 2 又 7 份 之 1 + 3 又 4 份 之 3 ) ÷ 5

    =( 7 份 之 15+ 4 份 之 15 ) ÷ 5

    =( 28份 之 60+ 28 份 之 105 ) ÷ 5

    = 28份 之 165 ÷ 5

    = 28份 之33

    Source(s): 自己
  • 1 decade ago

    1). (8 - 5.4 ) ÷ 13 × 2

    = 2.6 ÷ 13 x 2

    = 0.2 x 2

    = 0.4

    2)( 2 又 7 份 之 1 + 3 又 4 份 之 3 ) ÷ 5

    = (7份之15+4份之15) ÷ 5

    = (28份之60+28份之105)÷ 5

    = 28份之165 x 5份之1 (165同5約,將165删成33,將5刪去)

    = 28份之33

    = 1又28份之5

    希望可以幫到你-v-"

    Source(s): 自己計
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