Question

Afla termenul necunoscut din urmatoarele egalitati : a). [(4×m+5) :3 +10] : 5+5=10 ; b). [ ( 13+12 ×m ) ×10-330] : 100=13 .

Answer 1

a) [(4*m+5)/3+10]/5+5=10
[(4*m+5)/3+10]/5=10-5
[(4*m+5)/3+10]/5=5
[(4*m+5)/3+10]=5*5
[(4*m+5)/3+10]=25
[(4*m+5)/3]=25-10
[(4*m+5)/3]=15
(4*m+5)=15*3
(4*m+5)=45
4*m=45-5
4*m=40
m=40/4
m=10

b). [ ( 13+12 ×m ) ×10-330] : 100=13 .
 [ ( 13+12 ×m ) ×10-330]=13 x 100
[ ( 13+12 ×m ) ×10-330]=1300
( 13+12 ×m ) ×10=1300+330
( 13+12 ×m ) ×10=1630
( 13+12 ×m )=1630/10
( 13+12 ×m )=163
12 x m =163-13
12 x m=150
m=150/12
m=12,5