a) 10+10+10+10:5= b) 20: 2+ 10: 5= c) 30+ 40+ 50: 5= d) 80: 2+ 4= e) Tìm x: 30+ 20+ x = 80- 10

0 bình luận về “a) 10+10+10+10:5= b) 20: 2+ 10: 5= c) 30+ 40+ 50: 5= d) 80: 2+ 4= e) Tìm x: 30+ 20+ x = 80- 10”

1. a) 10+10+10+10:5

    = 10+10+10+ 2

    = 32

   b, 20: 2+ 10: 5

    = 10 + 2

    = 12

   c, 30+ 40+ 50: 5

    = 30+ 40+ 10

    = 80

   d) 80: 2+ 4

    = 40 + 4

    = 44

   e) Tìm x:

   30+ 20+ x = 80- 10

   <=> 30+ 20+ x = 70

   <=> 20+ x = 70 – 30

   <=> 20+ x = 40

   <=> x = 40 – 20

   <=> x = 20

    Vậy x= 20.

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2. $\text{@Vân}$

   a) 10+10+10+10:5

   =10+10+10+2

   =30+2

   =32

   b) 20: 2+ 10: 5

   =10+2

   =12

   c) 30+ 40+ 50: 5

   =30+40+10

   =80

   d) 80: 2+ 4

   =40+4

   =44

   e) Tìm x:

   30+ 20+ x = 80- 10

             50+x=70

                    x=70-50

                     x=20

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