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

Toán Lớp 6: tìm x, biết a) (x-45).29=0 b) 21.(34-x)=42 c)156-(x-61)=82 cho 2 tập hợ p sau A= ∫4;5;6;7;8;9;10 ∫ B= ∫x ∈ N ║8

Toán Lớp 6: tìm x, biết
a) (x-45).29=0
b) 21.(34-x)=42
c)156-(x-61)=82
cho 2 tập hợ p sau
A= ∫4;5;6;7;8;9;10 ∫
B= ∫x ∈ N ║8

Comments ( 2 )

  1. bài 1 :
    a) (x-45)×29=0
    =>x-45=0÷29
    =>x-45=0
    =>x=0+45
    =>x=45
    b)21×(34-x)=42
    =>34-x=42÷21
    =>34-x=2
    =>x=34-2
    =>x=32
    c)156-(x-61)=82
    =>x-61=156-82
    =>x-61=74
    =>x=74+61
    =>x=135
    bài 2:
     a)A={x∈N;3<x<11}
    b)B={9;10}
    bài 3:
    98×31+62=3038+62=3100

  2. Bài 1:
    (x – 45) . 29 = 0
    => x – 45 = 0
    => x = 0 + 45
    => x = 45
    21 . (34 – x) = 42
    => 34 – x = 42 : 21
    => 34 – x = 2
    => x = 32
    156 – (x – 61) = 82
    => 156 – x + 61 = 82
    => 156 – x = 82 – 61
    => 156 – x = 21
    => x = 156 – 21
    => x = 135
    Bài 2:
    A = {x ∈ NN** | 4 ≤ x ≤ 10}
    B = {9 ; 10}
    Bài 3:
    98 . 31 + 62
    = 98 . 31 + 31 . 2
    = (98 + 2) . 31
    = 100 . 31
    = 3100

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