1. Cand ai egalare de fractii atunci folosesti metoda asta
a/b=c/d , ad= bc
ab=2×5
ab=10
2. ab=3×7
ab= 21
ab-15= 21-15= 6
3. ab=24
2ab-24= 2×24-24= 24(2-1)= 24
4. 3ab=30
ab=30:3
ab=10
4ab+7= 4×10+7= 40+7=47
5. ab=660
ab/11-60= 660/11-60= 60-60=0
6. a) 6x=15
x=15/6= 5/2
b) 4x=6
x= 6/4=3/4
e) 6(x+2)=21
6x+12=21
6x=9
x= 3/2
f) 4(x-1)=15
4x-4=15
4x=19
x=19/4
