7. a) 4x=24 <=> x=6
b) x=6*10/5 <=> x=60/5 <=>x=12
c)x=60*3/45 <=>x = 180/45 <=> x=4
d) x=34*2/17 <=> x= 68/17 <=>x =4
e) x= 70*8/5 <=> x= 560/5 <=> x= 112
8. spatiul gol punem x si facem proporti
a) x= 7*5/12 <=> x= 35/12 =
b) x= 24*8/96 <=> x= 192/96 <=>x=2
c) x= 3*2/15 <=> x= 6/15 <=> x=0.4
d) x= 2*2/15 <=> x= 4/15 <=> x=0.26
e) x= 7*8/3 <=> x= 56/3 <=> x=18.67
f) x= 12*5/3 <=> x= 60/3 <=> x=20
g) x= 1*7/9 <=> x=7/9 <=> x= 0.77
h) x = 23*18/5 <=> x= 414 /5 <=> x= 82.8
i) x= 12*4/7 <=> x= 48/7 <=> x= 6.85
9. a*b= 4.1*2,(5) = 10.477777(5)
