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afla Nr necunoscute din expresiile de mai jos.
a) (×+20):12+68=78
b) (x+282-75):2=104
c) a×4:10+101=133
d) 101×[101-(101-102:x)]=202
e) 369[(x+112):5+113]=434
f) 104:[(x-3×8)×2:8]=13

Răspuns :

Elakissup3bs9j
A) (x+20):12=78-68
X+20=10x12
X=120-20
X=100
Verificare (100+20):12+68=78
120:12+68=78
10+68=78
78=78
B) (x+207)=104x2
X=208-207
X=1
Verificare (1+282-75):2=104
(283-75):2=104
208:2=104
104=104

C)ax4:10=133-101
Ax4=32x10
A=320:4
A=80
Verificare 80x4:10+101=133
320:10+101=133
32+101=133
133=133

D)101x[101-(101-102 :x)] =202
202:101=101-(101-102:x)
101-102 :x =101-2
101-99=102:x
X=102:2
X=51
Verificare 101x[101-(101-102 :51)] =202
101x[101 - (101-2)]=202
101 x(101-99)=202
101x2=202
202=202

E)369-[(x+112):5+113]=434

F) 104:[(x-24)x2:8]=13
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