Răspuns:
521=10x1-0+n
521=10+n
521-10=n
511=n
4+[4-(4+4:4x4-4)+a]:4=8
4+[4-(4+1x4-4)+a]:4=8
4+[4-(4+4-4)+a]:4=8
4+[4-(8-4)+a]:4=8
4+[4-4+a]:4=8
(4-4+a):4=8-4
(4-4+a):4=4
4-4+a=4x4
4-4+a=16
a=16-4+4
a=16-0
a=16
b:6x6:3x3=8+8+9:9+13
b:6x2x3=16+1+13
b:6x6=17+13
b:6x6=30
b:6=30:6
b:6=5
b=5x6
b=30
113+(113x8)=2000-y+y:y
113+904=2000-y+1
y=2000-113-904+1
y=984
(h:5-5)x9+186:6=400:10
(h:5-5)x9+31=40
(h:5-5)x9=40-31
(h:5-5)x9=9
h:5-5=9:9
h:5-5=1
h:5=1+5
h:5=6
h=6x5
h=30
8+6x[4+27:(0+ux9)]=49+10:10
8+6x[4+27:(0+ux9)]=49+1
8+6x[4+27:(0+ux9)]=50
6x[4+27:(0+ux9)]=50-8
6x[4+27:(0+ux9)]=42
4+27:(0+ux9)=42:6
4+27:(0+ux9)=7
27:(0+ux9)=7-4
27:(0+ux9)=3
0+ux9=27:3
ux9=9
u=9:9
u=1
[12-9:3+(12-9):3]xz+1=41
[12-3+3:3]xz=41
(12-3+1)xz=41
10xz=41
z=41:10
z=4,1
Explicație pas cu pas:
