12, Calculează va rog frumos repedeeeeeeeeeeee ajutor

Răspuns:
Explicație pas cu pas:
a) (18+2×7):(12:2+8:4)=(18+14):(6+2)=32:8=4
b) 24-24:3×(72:9-2×3):4×5=24-8×(8-6):4×5=24-8×2:4×5=24-16:4×5=
24-4×5=24-20=4
c) 42:7+(6+6):2-24:(5+3)=6+12:2-24:8=6+6-3=12-3=9
d) (25+20):5-(19+5):8=45:5-24:8=9-3=6