a ) X : 4 = 3845 - 2600 b) X x 3 = 3600 - 1200
X : 4 = 1245 X x 3 =2400
X = 1245 x 4 =4980 X = 2400 : 3 = 800
a)2600+x:4=3845
x:4=3845-2600
x-4=1245
x =1245+4
x=1249
b)x.3+1200=3600
x.3 =3600-1200
x.3 =2400
x =2400:3
x =800
a) X= 3845 x 4 - 2600 = 12780
b) X= (3600 - 1200):3=800