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