Question

a)90+{24:12x[20-5x(49:7-36:6)xa]}=100
b)48:4+{12+[60:5-(12:a+5):3]:5}:7=14
c){[(5a+5)x5+5]x5+5=1405
d)3X25:{5x6-[6x4:(10x2-12:nx3)-2]:2}+7=10
e){[(a+2)x2+2]x2+2}x2+2=30
f)3x4+2x9-{4+[45-5x(8-2m)+23]:4=14
g)1+{2x[3+(4+c):5]-6}x7=15
h)a:a+3a-2a=5
i)ax0+2a:1-a+3a=8

Answer 1

A) 2×[20-5×(7-6)×@]=100-90
2×(20-5×1×@)=10
2×(20-5@)=10
40-10@=10
-10@=10-40
-10@= - 30
@=30:10
@=3
Verificare :
90+{2×[20-5×(7-6)×3]}=100
90+[2×(20-5×1×3)]=100
90+(2×5)=100
90+10=100
100=100

B)12+{12+[12-(12:@+5):3]:5}:7=14
12+[12-(12:a+5):3]:5=(14-12)x7
12-(12:a+5):3=(2x7-12)x5
-(12:a+5)=(2x5-12)x3
12:a+5= 2x3
12:a=6-5
A=12:1
A=12

C)[(5a+5)x5+5]=(1405-5):5
(5a+5)=(280-5):5
5a=55-5
A=50:5
A=10

D)75:{30-[24:(20-12:nx3)-2]:2}=10-7
75:3=30-[24:(20-12:nx3)-2]:2
(25-30)x2=-[24:(20-12:nx3)-2]
-10=-[24:(20-12:nx3)-2]
10+2=24:(20-12:nx3)
20-12:nx3=24:12
-12:nx3=2-20
-12:n= - 18:3
-12:n= - 6
N=12:6
N=2


E) [(a+2)x2+2]x2+2=(30-2):2
[(a+2)x2+2]x2+2=28:2
(a+2)x2+2=(14-2):2
(a+2)x2+2=12:2
A+2=(6-2):2
A+2=4:2
A=2-2
A=0

F)12+18-{4+[45-5x(8-2m)+23]:4}=14
-{4+[45-5x(8-2m)+23]:4}=14-30( - 16)
4+[45-5x(8-2m)+23]:4=16
45-5x(8-2m)+23=(16-4)x4
45-5x(8-2m)=12x4-23
45-5x(8-2m)=48-23
-5x(8-2m)=25-45(-20)
40-10m=20
-10m=20-40(-20)
10m=20
M=2

G) 2x[3+(4+c):5]-6=(15-1):7
2x[3+(4+c):5]-6=14:7
3+(4+c):5=(2+6):2
3+(4+c):5=8:2
4+c=(4-3)x5
C=1x5-4
C=5-4
C=1

H)a:a+3a-2a=5
1+a=5
A=5-1
A=4

I)ax0+2a:1-a+3a=8
0+2a-a+3a=8
4a=8
A=2