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

2 câu trả lời

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.

$\text{@Vân}$

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