Question

Afla valoarea lui "a" din egalitatile : ax 9+4=670 ,5x a+5=560, 8xa -8=880, ax7+3=780 ,63:a+15=22, 72:a+13=22 ,a :6x8 =72 ,a:9 +14 =23

Answer 1

ax9+4=670
ax9=670-4
ax9=666
a=666:9
a=74

5xa+5=560
5xa=560-5
5xa=555
a=555:5
a=111

8xa-8=880
8xa=880+8
8xa=888
a=888:8
a=111

ax7+3=780
ax7=780-3
ax7=777
a=777:7
a=111

63:a+15=22
63:a=22-15
63:a=7
a=63:7
a=9

72:a+13=22
72:a=22-13
72:a=9
a=72:9
a=8

a:6x8=72
a:6=72:8
a:6=9
a=9x6
a=54

a:9+14=23
a:9=23-14
a:9=9
a=9x9
a=81

Mult succes la școală!