Question

Află valoarea termenului necunoscut: a)a:2:3=5,b)b:8+2000=2003, c)(394-123-c):2=108, d)(4×d+5)–6×2=5, e)e:7+(123×3-53x4)=164, f)923-f+145=693, g)g×g+648=7×100+2×10+3×3.

Answer 1

a) a:2:3=5
a:2=5×3
a:2=15
a=15×2=30
b) b:8+2000=2003
b:8=2003-2000
b:8=3
b=3×8=24
c) (394-123-c):2=108
(271-c):2=108
271-c=108×2
271-c=216
c=271-216=55
d)(4×d+5)-6×2=5
(4d+5)-12=5
4d+5=5+12
4d+5=17
4d=17-5
4d=12
d=12:4=3
e) e:7+(123×3-53×4)=164
e:7+(369-212)=164
e:7+157=164
e:7=164-157
e:7=7
e=7×7=49
f) f=375
g) g=9