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

Toán Lớp 6: 2(x – 5) – 3(x + 7) = 14 3(x – 4) – (8 – x) = 12 x – 12 – 25) = -8 175 – 5(x + 3) = 85

Tháng Ba 4, 2023 Toán học 2 Comments 0 views

Toán Lớp 6: 2(x – 5) – 3(x + 7) = 14
3(x – 4) – (8 – x) = 12
x – 12 – 25) = -8
175 – 5(x + 3) = 85

Comments ( 2 )

  1. maingocquynhnhu2k1
    maingocquynhnhu2k1
    4 Tháng Ba, 2023 at 9:02 sáng
    Reply
    2(x – 5) – 3(x + 7) = 14
    <=>2x-10-3x-21=14
    <=>2x-3x=14+10+21
    <=>-x=45
    <=>x=-45
    Vậy x=-45 
                                                                        
    3(x – 4) – (8 – x) = 12
    <=>3x-12-8+x=12
    <=>3x+x=12+12+8
    <=>4x=32
    <=>x=32:4=8
    Vậy x=8
                                                                        
    x-(12-15)=-8
    <=>x-12+15=-8
    <=>x+3=8
    <=>x=8-3=5
    Vậy x=5
                                                                        
    175 – 5(x + 3) = 85
    <=>175-5x-15=85
    <=>-5x=85+15-175
    <=>-5x=-75
    <=>x=15
    Vậy x=15

  2. tuyethutanhthu
    tuyethutanhthu
    4 Tháng Ba, 2023 at 9:02 sáng
    Reply
    2 ( x – 5 ) – 3 ( x + 7 ) = 14
    ⇔ 2x – 10 – 3x – 21 = 14
    ⇔ – x – 31 = 14
    ⇔ – x = 14 + 31
    ⇔ – x = 45
    ⇔ x = – 45
    Vậy x = – 45
    ———————————–
    3 ( x – 4 ) – ( 8 – x ) = 12
    ⇔ 3x – 12 – 8 + x = 12
    ⇔ 4x – 20 = 12
    ⇔ 4x = 12 + 20
    ⇔ 4x = 32
    ⇔ x = 8
    Vậy x = 8
    —————————————–
    x – ( 12 – 25 ) = – 8
    ⇔ x – 12 + 25 = – 8
    ⇔ x + 13 = – 8
    ⇔ x = – 8 – 13
    ⇔ x = – 21
    Vậy x = – 21
    ————————————
    175 – 5 ( x + 3 ) = 85
    ⇔ 175 – 5x – 15 = 85
    ⇔ 160 – 5x = 85
    ⇔ – 5x = 85 – 160
    ⇔ – 5x = – 75
    ⇔ x = ( – 75 ) : ( – 5 )
    ⇔ x = 15
    Vậy x = 15

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

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