a.(665-13 x 13) : X : 2 = 31 b.18 : (496 : 124 x X – 6) + 197 = 200 c.(545 – X : 2 X 5) : 25 = 17 d.(5 – 6 x X) – (2 x X – 51

2 bình luận về “a.(665-13 x 13) : X : 2 = 31 b.18 : (496 : 124 x X – 6) + 197 = 200 c.(545 – X : 2 X 5) : 25 = 17 d.(5 – 6 x X) – (2 x X – 51”

1. Giải đáp + Lời giải và giải thích chi tiết:

    a, (665-13 xx13):x:2 = 31

   (665 -169):x:2 = 31

   496:x:2=31

   496:x = 31 xx2 = 62

   x = 496:62

   x = 8

   b, 18: (496:124xx x-6)+197 = 200

   18:(4xx x-6) = 200-197 = 3

   4 xx x – 6 = 18:3 = 6

   4x = 6+6

   4x =12

   x = 12:4=3

   c, (545 – x :2 xx 5):25 = 17

   545- x:2xx5 = 17 xx25 = 425

   x:2xx5 = 545-425

   x:2xx5=120

   x:2 = 120:5

   x:2 = 24

   x=24xx2

   x = 48

   d, (5-6 xx x)-(2xx x-51)=8

   5 – 6 xx x -2 xx x+51 = 8

   5 – 8xx x +51=8

   56-8xx x = 8

   8xx x = 56-8

   8xx x = 48

   x = 48:8 = 6

   x=6

   @riiumecou

   Trả lời
2. a)(665-13xx13):x:2=31

   (665-169):x=31xx2

   496:x=62

   x=496:62

   x=8

   Vậy x=8

   _______________________________

   b)18:(496:124xx x-6)+197=200

   18:(496:124xx x-6)=200-197

   18:(496:124xx x-6)=3

   496:124xx x-6=18:3

   496:124xx x-6=6

   4xx x=6+6

   4xx x=12

   x=12:4

   x=3

   Vậy x=3

   __________________________________

   c)(545-x:2xx5):25=17

   545-x:2xx5=17xx25

   545-x:2xx5=425

   x:2xx5=545-425

   x:2xx5=120

   x:2=120:5

   x:2=24

   x=24xx2

   x=48

   Vậy x=48

   ________________________________

   d)(5-6xx x)-(2xx x-51)=8

   5-6xx x-2xx x+51=8

   (5+51)-(6xx x+2xx x)=8

   56-x xx(6+2)=8

   x xx8=56-8

   x xx8=48

   x=48:8

   x=6

   Vậy x=6

   ___________________________________

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   Trả lời