Question

Aflà valoarea termenului necunoscut:
a) 1 X 2 X 3 X a = 24
b) b x 2 x 5 = 40
c) c:2:3=5
d) 27:3:3xd=6X4
e) e:8 + 2000 = 2003
f) (6 X 6 - 27) xf=81
g) (394 - 123 - g): 2 = 108
h) 6 x 5:10 + h = 296
i) [(124 + 692) – 400 x 2]: j= 4
J) (24:3+ 45:5) + 143 = 4.j + 124
K) 12x2:k=4
L) (4 x / + 5) - 6 x 2 = 5
m) m:7+(123 x 3-53 x 4) = 164
n) (n - 45:9) X 3 = 2185 - 2164
o) (24-7 X 3) x 5X2:0=30:10
p) (p - 28:7 + 200) X 5 = 32 000 + 3 x 10
q) 923-q + 145 = 693
r) rxr+ 648 = 7 X 100 + 2 x 10+ 3x3 ​

Answer 1

a) 1x2x3xa=24
6xa=24
a=24:6
a=4

b) bx2x5=40
bx10=40
b=40:10
b=4

c) c:2:3=5
c=5x2x3
c=30

d) 27:3:3xd=6x4
9:3xd=24
3xd=24
d=24:3
d=8

e) e:8+2000=2003
e:8=2003-2000
e:8=3
e=3x8
e=24

f) (6x6-27)xf=81
(36-27)xf=81
9xf=81
f=81:9
f=8

g) (394-123-g):2=108
271-g=108x2
271-g=216
g=271-216
g=55

h) 6x5:10+h=296
30:10+h=296
3+h=296
h=296-3
h=293

i) [(124+692)-400x2]:j=4
(816-800):j=4
16:j=4
j=16:4
j=4

j) (24:3+45:5)+143=4xj+124
8+9+143=4xj+124
160=4xj+124
4j= 160-124
4j=36
j=36:4
j=9

k) 12x2:k=4
24:k=4
k= 24:4
k=6

l) (4xl+5)-6x2=5
4l+5-12=5
4l+5=17
4l=17-5
4l=12
l=12:4
l=3

m) m:7+(123x3-53x4)=164
m:7+(369-212)=164
m:7+157=164
m:7=164-157
m:7=7
m=7x7
m=49

n) (n-45:9)x3=2185-2164
(n-5)x3=21
n-5=21:3
n-5=7
n=7+5
n=12

o) (24-7x3)x5x2:o=30:10
(24-21)x10:o=3
3x10:o=3
30:o=3
o=30:3
o=10

p) (p-28:7+200)x5=32000+3x10
(p-4+200)x5=32030
p-4+200=32030:5
p-4+200=6406
p=6406+4-200
p=6210

q) 923-q+145=693
923-q=693-145
923-q=548
q=923-548
q=375

r) rxr+648=7x100+2x10+3x3
rxr+648=700+20+9
rxr=729-648
rxr=81
r=9