Question

afla numerele necunoscute.a)45:ax100=900,160x5:a=100,b)824-240:a=800,245+50xa=745,c)a:12x9=396,ax16:5=1360.

Answer 1

a) 45/a×100=900, 4500/a=900,  4500=900a, 900a=4500, a=5,  a≠0, a=5.
b) 824-240/a=800, 824-240/a=800, -240/a=-24, -240=-24a, -24a=-240, a=10.
c)a/12×9=396, a/4×3=396, 3a=1584, a=528.
a×16/5=1360, 16a/5=1360, 16a=6800,a=425..........

Answer 2

45:ax100=900

ax100=900:45

ax100=20

a=100:20

a=5

160x5:a=100

800:a=100

a=800:100

a=8

824-240:a=800

240:a=824-800=

         =24

a=240:24

a=10

245+50xa=745

50xa=745-245

50xa=500

a=500:50

a=10

a:12x9=396

a:12=396:9

a:12=44

a=44x12

a=528

ax16:5=1360

ax16=1360x5

ax16=6800

a=6800:16

a=425

a=