Răspuns:
a) 4×(5×)-14=50
4×5×-14=50
20×-14=50
20×=50+14
20×=64
X= 16/ 5
b) 12+6×+3=24
15+6×=24
6×=24-15
6×=9
×= 3/2
c) (15×-10-1)÷2+5=7
15×-11÷2+5=7
15×-11÷2+5=7
15×-11 totul supra 2 +5=7
15×-11+10=14
15×-1=14
15×=14+1
15×=15
X= 1
d) 3+ 24X-4 ÷47+9=10
(-1+24×)÷47+9=10
-1+24×totul Supra 47 +9=10
-1 +24×+423=470
422+24×=470
24×=470-422
24×=48
×= 2