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Afla nr necunoscute din expresiile de mai jos .
a. ( x + 20 ) : 12 + 68 = 78
b. (x + 282 - 75 ) : 2 = 104
c. a x 4: 10 + 101 =133
d. 101 x [101 - ( 101 - 102 : a )] = 202
e. 369 - [ ( a + 112 ) : 5 + 113 ] = 434
f. 104 : [ ( a - 3 x 8 ) x2 :8 ] = 13

Răspuns :


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

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