b,(2+x):5=6
2+x=6.5=30
x=30-2=28
c,2x-3=11
2x=11+3=14
x=14:2=7
d,2+x:5=6
x:5=6-2=4
x=4.5=20
b) (2 + x) : 5 = 6
2 + x = 6 × 5
2 + x = 30
x = 30 - 2
x = 28
Vậy x = 28
c) 2 × x - 3 = 11
2 × x = 11 + 3
2 × x = 14
x = 14 : 2
x = 7
Vậy x = 7
d) 2 + x : 5 = 6
x : 5 = 6 - 2
x : 5 = 4
x = 4 × 5
x = 20
Vậy x = 20
b,(2+x):5=6
<=>2+x=6.5
<=>2+x=30
<=>x=30-2
<=>x=28
Vậy x=28
c,2x-3=11
<=>2x=11+3
<=>2x=14
<=>x=14:2
<=>x=7
Vậy x=7
d,2+x:5=6
<=>x:5=6-2
<=>x:5=4
<=>x=4.5
<=>x=20
Vậy x=20