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

Toán Lớp 6: Tìm x e N h) 3.{15×4[20-(x+5)]}=105. i) 115-2x{84-2[13+5(x-2)]} = 99

Home/ Toán Lớp 6: Tìm x e N h) 3.{15×4[20-(x+5)]}=105. i) 115-2x{84-2[13+5(x-2)]} = 99

Toán Lớp 6: Tìm x e N h) 3.{15×4[20-(x+5)]}=105. i) 115-2x{84-2[13+5(x-2)]} = 99

Tháng Tám 2, 2022 Toán học 2 Comments 0 views

Toán Lớp 6: Tìm x e N h) 3.{15×4[20-(x+5)]}=105. i) 115-2x{84-2[13+5(x-2)]} = 99

Comments ( 2 )

  1. truongthanhhung
    truongthanhhung
    2 Tháng Tám, 2022 at 7:42 sáng
    Reply
    h)3.{15xx4[20-(x+5)]}=105
    15xx4[20-(x+5)]=105:3=35
    60[20-(x+5)]=35
    20-(x+5)=35:60=7/12
    x+5=20- 7/12=233/12
    x=233/12 – 5=173/12
    i)115-2xx{84-2[13+5(x-2)]}=99
    2xx{84-2[13+5(x-2)]}=115-99=16
    84-2[13+5.(x-2)]=16:2=8
    2[13+5.(x-2)]=84-8=76
    13+5(x-2)=76:2=38
    5(x-2)=38-13=25
    x-2=25:5=5
    x=5+2=7

  2. cattien
    cattien
    2 Tháng Tám, 2022 at 7:42 sáng
    Reply
    h) 3 . {15 . 4[20 – (x + 5)]} = 105
    {60[20 – (x + 5)]} = 105 : 3
    {60[20 – (x + 5)]} = 35
    60[20 – (x + 5)]= 35
    20 – (x + 5) = 60 : 35
    20 – (x + 5) = 7/12
    x + 5 = 20 – 7/12
    x + 5 = 233/12
    x = 233/12 – 5
    x = 173/12
    i) 115 – 2{84 – 2[13 + 5(x – 2)]} = 99
    2{84 – 2[13 + 5(x – 2}]} = 105 – 99
    2{84 – 2[13 + 5(x – 2)]} = 16
    84 – 2[13 + 5(x – 2)] = 8
    2[13 + 5(x – 2)] = 84 – 8
    2[13 + 5(x – 2)] = 76
    13 + 5(x – 2) = 76 : 2
    13 + 5(x – 2) = 38
    5(x – 2) = 38 – 13
    5(x – 2) = 25
    x – 2 = 25 : 5
    x – 2 = 5
    x = 5 + 2
    x = 7

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