Răspuns :
A) x/5=12/3
X=5x12:3
X=60:3
X=20
B)4/x=2/7
X=4x7:2
X=28:2
X=14
C)10/3=70/x
X=70x3:10
X=210:10
X=21
D)ab/3=18/2
Ab=18x3:2
Ab=54:2
Ab=27
X=5x12:3
X=60:3
X=20
B)4/x=2/7
X=4x7:2
X=28:2
X=14
C)10/3=70/x
X=70x3:10
X=210:10
X=21
D)ab/3=18/2
Ab=18x3:2
Ab=54:2
Ab=27