Question

Afla 1/2 din: (3a+3b-2c) stiind ca:
a=(8x8+6x6):10+2x5x3
b=100-36+(30:5+20:10):8-5
c=21:7x10-(185-95):9
Va rog cu detalii !!

Answer 1

a=(64+36)÷10+10×3=100÷10+30=10+30=40
b=64+(6+2)÷8-5=64+8÷8-5=64+1-5=65-5=60
c=3×10-90÷9=30-10=20
3×40+3×60+2×20=120+180+40=300+40=340
340÷2=170