Răspuns:
62=>13
63=>96
64=>16
65=>38
66=>20
67=>5
68=>24
Explicație pas cu pas:
62. (9×7+n-5×8)-5×5+70=75
(63+n-40)-5×5+70=75
(63+n-40)-25+70=75
(63+n-40)-25=75-70
(63+n-40)-25=5
63+n-40=5+25
63+n-40=30
63+n=30+40
63+n=70
n=70-63
n=13
63. (87-9×4-o)-5×5+10:2=5×2-0:4×7
(87-36-o)-25+5=25-0×7
(51-o)-25+5=25-0
(51-o)-25+5=25
(51-o)-25=25-5
51-o-25=20
51-o=20+25
51-o=45
o=45+51
o=96
64. 93-(85-9×9+5×8)-p =5×6+1
93-(85-81+40)-p=30+1
93-(4+40)-p=31
93-44-p=31
47-p=31
p=47-31
p=16
65. (5×5+6×6-r )+6×5-5×10=9:3
(25+36-r)+30-50=3
(61-r)+30-50=3
(61-r)+30=3+50
(61-r)+30=53
61-r=53-30
61-r=23
r=61-23
r=38
66. (8×9+s-5×8)-(30-5×2+5)=100:2:2
(72-s-40)-(30-10+5)=50:2
(72-s-40)-(20+5)=25
(72-s-40)-25=25
72-s-40=25+25
70-s-40=50
70-s=50+40
70-s=90
s=90-70
s=20
67. (36-5×6+t)+9×8-7×10=4×7:7
(36-30+t)+72-70=28:7
(6+t)+73-70=4
6+t+73=4+70
6+t+73=74
6+t=74-73
6+t=1
t=6-1
t=5
68. (7×7-6×6+u)-24:3-2×10=81:9
(49-36+u)-8-20=9
(13+u)-8-20=9
13+u-8=9+20
13+u-8=29
13+u=29+8
13+u=37
u=37-13
u=24
