Question

Află numărul necunoscut din fiecare exercițiu .
(40-c:3)×2=68
a×8+124=300
1000-63:b=991
Va multumesc !

Answer 1

(40-c:3)x2=68
40-c:3=68:2
40-c:3=34
40-c=34x3
40-c= 102
c=102+40
c=142

Answer 2

(40-c;3)x2=68= (40-c:3)=68:2=(40-c:3)=34   c:3=34+40=c:3=74   c=  74x3=222 ax8=300-124=    ax8=176    a=176:8=22    63:b=1000-991=9    b=63;9=7