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

Toán Lớp 6: Tìm x a) -129 – 2x = -9 b) x – (-14) = 131 c) (5x – 20):10 – 20 =150 + (-170) d) 62 – (2x – 5):5 = -71 – 199 e) 212 – 3(2x – 2) = 242 f

Tháng Sáu 22, 2022 Toán học 2 Comments 0 views

Toán Lớp 6: Tìm x
a) -129 – 2x = -9 b) x – (-14) = 131
c) (5x – 20):10 – 20 =150 + (-170) d) 62 – (2x – 5):5 = -71 – 199
e) 212 – 3(2x – 2) = 242 f) x + (-112) = -112 – (-121)

Comments ( 2 )

  1. haiyemy
    haiyemy
    22 Tháng Sáu, 2022 at 1:55 sáng
    Reply
    Giải đáp: a,????=−60
                 b, ????=117
                 c, ????=4
                 d, ????=1665/2
                 e, x=121
     
    Lời giải và giải thích chi tiết:
    a) -129 – 2x = -9 
        −2????−129=−9
        −2????−129+129=−9+129
        −2????=−9+129
        −2????=120
        −2????/−2=120/−2
        ????=120/−2
        ????=−60
    b) x – (-14) = 131
        ????+14=131
        ????+14−14=131−14
        ????=131−14
        ????=117
    c) (5x – 20):10 – 20 =150 + (-170)
        5????−20 :10+10(−20) :10=150+(−170)
        5????−20+10(−20): 10=150+(−170)
        5????−20−200 : 10=150+(−170)
        5????−220 : 10=150+(−170)
        5????−220 : 10=−20
        10⋅5????−220 : 10=10(−20)
         5????−220=10(−20)
        5????−220=−200
        5????−220+220=−200+220
        5????=−200+220
        5????=20
        5????:5=20:5
        ????=20:5
        ????=4
    d) 62 – (2x – 5):5 = -71 – 199
        5⋅62:5+−2????+5:5=−71−199
        5⋅62−2????+5:5=−71−199
       310−2????+5:5=−71−199
      315−2????:5=−71−199
      −2????+315:5=−71−199
      −2????+315:5=−270
      5⋅−2????+315:5=5(−270)
      −2????+315=5(−270)
      −2????+315=−1350
      −2????+315−315=−1350−315
      −2????=−1350−315
      −2????=−1665
      −2????:−2=−1665:−2
      ????=−1665:−2
      ????=1665/2
    e) 212 – 3(2x – 2) = 242
        212−6????+6=242
        218−6????=242
        −6????+218=242
        −6????+218−218=242−218
        −6????=242−218
        −6????=24
        −6????:−6=24:−6
        ????=24:−6
        ????=−4
    f) x + (-112) = -112 – (-121)
       ????−112=−112−1(−121)
      ????−112=−112+121
      ????−112=9
      ????−112+112=9+112
      ????=9+112
      ????=121

  2. doanthulan
    doanthulan
    22 Tháng Sáu, 2022 at 1:55 sáng
    Reply
    Lời giải và giải thích chi tiết:
    a) -129 – 2x = -9
                   2x = ( -129 ) – ( -9 )
                   2x = ( -129 ) + 9
                   2x = -120
                     x = ( -120 ) : 2
                     x = -60

    b) x – ( -14 ) = 131
             x + 14 = 131
                      x = 131 – 14
                      x = 117

    c) (5x – 20):10 – 20 =150 + (-170)
        ( 5x – 20 ) : 10 – 20 = 150 – 170
        ( 5x – 20 ) : 10 – 20 = -20
               ( 5x – 20 ) : 10 = ( -20 ) + 20
               ( 5x – 20 ) : 10 = 0
                        5x – 20   = 0 xx 10
                         5x – 20 = 0
                                  5x = 0 + 20
                                  5x = 20
                                     x = 20 : 5
                                     x = 4

    d) 62 – (2x – 5):5 = -71 – 199
        62 – ( 2x – 5 ) : 5 = -270
                ( 2x – 5 ) : 5 = 62 – ( -270 )
                ( 2x – 5 ) : 5 = 62 + 270
                ( 2x – 5 ) : 5 = 332
                       2x – 5  = 332 xx 5
                       2x – 5 = 1660
                           2x = 1660 + 5
                           2x = 1665
                             x = 1665 : 2
                             x = 832,5

    e) 212 – 3(2x – 2) = 242
                  3( 2x – 2 ) = 212 – 242
                   3 ( 2x – 2 ) = -30
                         2x – 2 = ( -30 ) : 3
                         2x – 2 = -10
                           2x = -10 + 2
                             2x = -8
                               x = -8 : 2
                               x = -4

    f) x + (-112) = -112 – (-121)
           x – 112 = -112 + 121
           x – 112 = 9
                       x = 9 + 112
                       x = 121
       

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

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