a) (x-20):11=72
x - 20 = 72 x 11
x - 20 = 792
x = 792 + 20
x = 812
b) 6:x + 18:x =8
( 6 + 18 ) : x = 8
24 : x = 8
x = 24 : 8
x = 3
a) (x-20) :11=72
x-20 =72 x 11
x-20 =792
x =792+20
x =1012
b) 6:x + 18:x=8
(6+18):x =8
24 :x =8
x =24:8
x =3
nhé!!!
a, <=> x - 20 = 72 . 11
<=> x - 20 = 792
<=> x = 792 + 20
<=> x = 812
#hoc_tot#