17)
a)
7x8=65
10x7=70
6x9=54
5x4=10
6x2=12
8x5=40
9x7=63
7x8=56
b)
64:8=8 (Rest 0)
56:8=7 (Rest 0)
72:9=8 (Rest 0)
76:8=9 (Rest 4)
76:10=7 (Rest 6)
10:6=1 (Rest 4)
28:3=9(Rest 1)
56:2=28(Rest 0)
18)
a) 2+[9-(8+ax6):10]x4=30
2+[9-(8+6a):10]x5=30
2+(9-[tex]\frac{8+6a}{10}[/tex])x4=30
2+36-[tex]\frac{2(8+6a}{5}[/tex]=30
2+36-[tex]\frac{16+12a}{5}[/tex]=30
38-[tex]\frac{16+12a}{5}[/tex]=30
190-(16+12a)=150
190-16-12a=150
174-12a=150
-12a=150-174
-12a=-24
a=4
srry nu stiu restul
