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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 6: Bài 1: Tìm x€N biết a) (x – 289) . 47 = 0 b) 54 .(84 – x) =54 c) 7 . x – 10= 704 d) 928 – (31+ x) = 128

Toán Lớp 6: Bài 1: Tìm x€N biết
a) (x – 289) . 47 = 0
b) 54 .(84 – x) =54
c) 7 . x – 10= 704
d) 928 – (31+ x) = 128

Comments ( 2 )

  1. a) (x-289) . 47 =0
    => x-289 = 0:47
    => x-289  =0
    =>x= 0+289
    => x= 289
    Vậy x= 289
    b) 54( 84 – x) = 54
    => 84-x= 54:54
    => 84 -x = 1
    => x= 84 -1
    => x= 83
    Vậy x= 83
    c) 7 x – 10 = 704
    => 7x = 704 + 10
    => 7x = 714
    => x = 714:7
    => x= 102
    Vậy x= 102
    d) 928 – (31 +x) = 128
    => 31 + x= 928  – 128
    => 31 +x = 800
    => x= 800-31
    => x= 769
    Vậy x= 769
     

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222-9+11+12:2*14+14 = ? ( )

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