1.Tìm x, biết a, 11/13 – ( 5/42 – x ) = – (15/28 – 11/13 ) b, x + 1/3 = 2/5 – ( -1/3) c, – 5/8 – x = – 3/20 – (-1/6) d, x – (-1/4) = -5/6+1/8 e,

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1.Tìm x, biết
a, 11/13 – ( 5/42 – x ) = – (15/28 – 11/13 )
b, x + 1/3 = 2/5 – ( -1/3)
c, – 5/8 – x = – 3/20 – (-1/6)
d, x – (-1/4) = -5/6+1/8
e, -2/3 x = 4/15
g, x : 22/15 = -8/27
giúp mk vs mn ơi!!!!!!!!!!!!!!!!

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  1. a, 11/13 – (5/42 – x) = – (15/28 – 11/13)

    →              5/42-x     = 113/364+11/13

    →                       x     = 5/42-421/364

    →                       x     = -1133/1092

    b, x + 1/3 = 2/5 – ( -1/3)

    → x           = 11/15-1/3

    → x           = 2/5

    c, – 5/8 – x = – 3/20 – (-1/6)

    → x            = -5/8-1/60

    → x            = -77/120

    d, x – (-1/4) = -5/6+1/8

    → x              = -17/24+(-1/4)

    → x              = -23/4

    e, -2/3 x = 4/15

    →         x = 4/15:(-2/3)

    →         x = -2/5

    g, x : 22/15 = -8/27

    → x             = -8/27.22/15

    → x             = -176/405

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  2. `a, 11/13 – (5/42 – x) = – (15/28 – 11/13)`

    `⇔5/42-x     = 113/364+11/13`

    `⇔x     = 5/42-421/364`

    `⇔x     = -1133/1092`

    `b, x + 1/3 = 2/5 – ( -1/3)`

    `⇔x           = 11/15-1/3`

    `⇔x           = 2/5`

    `c, – 5/8 – x = – 3/20 – (-1/6)`

    `⇔x            = -5/8-1/60`

    `⇔x            = -77/120`

    `d, x – (-1/4) = -5/6+1/8`

    `⇔x              = -17/24+(-1/4)`

    `⇔x              = -23/4`

    `e, -2/3 x = 4/15`

    `⇔x = 4/15÷(-2/3)`

    `⇔x = -2/5`

    `g, x ÷22/15 = -8/27`

    `⇔x             = -8/27 . 22/15`

    `⇔x             = -176/405`

    Xin hay nhất !

     

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