Question

Afla necunoscuta :
a) (2 x 3 + d ) - (7 x 9 + 6) = 7 x 7
b) ( 6 x 4 +c ) - 6 x 4 = 2 x 2
c) ( e - 5 x 6 + 10 x 5 )- 50 +4 x 8=42
d) (96 -3 x 4 -5 x 8 ) +f - 9 x 7 = 13
e) (23 - 6 x 3 + g ) + 3 x 9 - 8 x 3 - 28 = 34
f ) ( 3 x 9 + 7 x h - 53 ) + 5 x 2 - ( 12 - 4 x 2 )= 6 x 6

Va multumesc mult !

Answer 1

(2x3+d)-69=49
6+d-69=49
d=49+69
d=112

Answer 2

a)(2x3+d)-(7x9+6)=7x7
(6+d)-(63+6)=49
6+d-69=49
6+d=49+69
6+d=118
d=118-6
d=112

b)(6x4+c)-6x4=2x2
24+c-24=4
24+c=4+24
24+c=28
c=28-24
c=4

c)(e-5x6+10x5)-50+4x8=42
(e-30+50)-50+32=42
e-30+50=42-32+50
e-30+50=60
e-30=60-50
e-30=10
e=10+30
e=40

d)(96-3x4-5x8)+f-9x7=13
(96-12-40)+f-63=13
44+f-63=13
44+f=13+63
44+f=76
f=76-44
f=34

e)(23-6x3+g)+3x9-8x3-28=34
(23-18+g)+27-24=34+28
5+g+3=62
5+g=62-3
5+g=59
g=59-5
g=54

f)(3x9+7xh-53)+5x2-(12-4x2)=6x6
(27+7xh-53)+10-(12-8)=36
(27+7xh-53)+10-4=36
(27+7xh-53)+10=36+4
(27+7xh-53)+10=40
27+7xh-53=40-10
27+7xh-53=30
27+7xh=30+53
27+7xh=83
7xh=83-27
7xh=56
h=56:7
h=8