tim y : y : 15 – 34,87 = 52,21 + 6 76,22 – y x 3 = 30,61 x 2 2. tinh thuan tien 60 – 26,75 – 13,25 38,25 –

2 bình luận về “tim y : y : 15 – 34,87 = 52,21 + 6 76,22 – y x 3 = 30,61 x 2 2. tinh thuan tien 60 – 26,75 – 13,25 38,25 –”

1. Giải đáp:

    1)

   a)

   y:15-34,87=52,21+6

   y:15-34,87=58,21

   y:15=58,12+34,87

   y:15=92,99

   y=92,99xx15

   y=1394,85

   Vậy y=1394,85

   b)

   76,22-yxx3=30,61xx2

   76,22-yxx3=61,22

   yxx3=76,22-61,22

   yxx3=15

   y=15:3

   y=5

   Vậy y=5

   2)

   a)

   60-26,75-13,25

   =60-(26,75+13,25)

   =60-40

   =20

   b)

   38,25-18,25+21,64-11,64+9,93

   =(38,25-18,25)+(21,64-11,64)+9,93

   =20+1+9,93

   =30+9,93

   =39,93

   c)

   45,28+52,17-15,28-12,43

   =(45,28-15,28)+(52,17-12,43)

   =30+39,74

   =69,74

    

   Trả lời
2. y : 15 – 34,87 = 52,21 + 6

   y : 15 – 34,87 = 58,21

   y : 15 = 58,21 +34,87

   y : 15 = 93,08

         y  = 93,08 x 15

         y  = 1396,2

   76,22 – y x 3 = 30,61 x 2

   76,22 – y x 3 =  61,22

   y x 3 = 76,22 – 61,22

   y x 3 =   15

         y =   15 : 3

         y =  5

   60 – 26,75 – 13,25

   = 60 – ( 26,75 + 13,25)

   = 60 – 40

   = 20

   38,25 – 18,25 + 21,64 – 11,64 + 9,93

   = 38,25 – 18,25 + 21,64 – 11,64 + 9,93

   = 20 + 10 + 9,93

   = 30 + 9,93

   = 39,93

   45,28 + 52,17 – 15,28 – 12,43

   =( 45,28 – 15,28 )+( 52,17- 12,17  )

   =30+40

   =70     

   Trả lời