a) 10-15+20-25+….+100-105 b) 1-3+5-7+…+201-203 c) (723-38)-723 d) -1982-(18-1982) e) (2017-82+17)-(-82+2017) f) -(-79+18)+(-18-79+6) TRÌNH BÀY ĐẦY

a) 10-15+20-25+….+100-105
b) 1-3+5-7+…+201-203
c) (723-38)-723
d) -1982-(18-1982)
e) (2017-82+17)-(-82+2017)
f) -(-79+18)+(-18-79+6)
TRÌNH BÀY ĐẦY ĐỦ MÌNH SẼ VOTE 5* UY TÍN TẠO NÊN THƯƠNG HIỆU

0 bình luận về “a) 10-15+20-25+….+100-105 b) 1-3+5-7+…+201-203 c) (723-38)-723 d) -1982-(18-1982) e) (2017-82+17)-(-82+2017) f) -(-79+18)+(-18-79+6) TRÌNH BÀY ĐẦY”

  1. a) 10 – 15 + 20 – 25 + … + 100 – 105

    10 – 15 + 20 – 25 + … + 100 – 105

    = (10 – 15) + (20 – 25) + … + (100 – 105) (có 20 : 2 = 10 ngoặc)

    = -5 . 10 

    = -50

    b) 1 – 3 + 5 – 7 + … + 201 – 203

    = (1 – 3) + (5 – 7) + … + (201 – 203) (có 102 : 2 = 51 ngoặc)

    = -2 . 51

    = -102

    c) (723 – 38) – 723

    = 723 – 38 – 723

    = (723 – 723) – 38

    = 0 – 38

    = -38

    d) -1982 – (18 – 1982)

    = -1982 – 18 + 1982

    = (-1982 + 1982) – 18

    = 0 – 18

    = -18

    e) (2017 – 82 + 17) – (-82 + 2017)

    = 2017 – 82 + 17 + 82 – 2017

    = (2017 – 2017) + (82 – 82) + 17

    = 0 + 0 + 17

    = 17

    f) -(-79 + 18) + (-18 – 79 + 6)

    = 79 – 18 – 18 – 79 + 6

    = (79 – 79) + (-18 – 18) + 6

    = 0 + -36 + 6

    = -30

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  2. `text{a) 10 – 15 + 20 – 25 + … + 100 – 105}`

    `text{10 – 15 + 20 – 25 + … + 100 – 105}`

    `text{= (10 – 15) + (20 – 25) + … + (100 – 105) (có 20 : 2 = 10 ngoặc)}`

    `text{= -5 . 10}`

    `text{= -50}`

    `text{b) 1 – 3 + 5 – 7 + … + 201 – 203}`

    `text{= (1 – 3) + (5 – 7) + … + (201 – 203) (có 102 : 2 = 51 ngoặc)}`

    `text{= -2 . 51}`

    `text{= -102}`

    `text{c) (723 – 38) – 723}`

    `text{= 723 – 38 – 723}`

    `text{= (723 – 723) – 38}`

    `text{= 0 – 38}`

    `text{= -38}`

    `text{d) -1982 – (18 – 1982)}`

    `text{= -1982 – 18 + 1982}`

    `text{= (-1982 + 1982) – 18}`

    `text{= 0 – 18}`

    `text{= -18}`

    `text{e) (2017 – 82 + 17) – (-82 + 2017)}`

    `text{= 2017 – 82 + 17 + 82 – 2017}`

    `text{= (2017 – 2017) + (82 – 82) + 17}`

    `text{= 0 + 0 + 17}`

    `text{= 17}`

    `text{f) -(-79 + 18) + (-18 – 79 + 6)}`

    `text{= 79 – 18 – 18 – 79 + 6}`

    `text{= (79 – 79) + (-18 – 18) + 6}`

    `text{= 0 + -36 + 6}`

    `text{= -30}`

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