Question

vă rog .....măcar câteva plsssss​

Answer 1

27.

521 = 10 - 0 + n

521 = 10 + n

-n = 10-521

-n = -511

n = 511

28.

4+ ( 4- 4 + a) ÷ 4 =8

4+ a ÷ 4= 8

4 + 1/4 a = 8

16 + a = 32

a = 32 -16

a= 16

29.

1/6 b × 2 ×3 = 8+8 + 1 +13

1/3 b × 3= 30

b = 30

30.

113 + 904= 2000 -y + y ÷ y , y≠0

1017 = 2000 -y + 1

1017 = 2001 - y

y = 2001 - 1017

y = 984 , y≠0

y = 984

31.

( 1/5 h - 5) × 9 + 31= 40

9/5 h -45 +31= 40

9/5 h - 14 = 40

9h - 70 = 200

9h = 270

h= 30

32.

u ≠ 0

8+6 ( 4+27 ÷ (9u)) = 49 + 1

8+6(4 + 27/(9u)) = 50

8 +6 (4+ 3/u) = 50

8+ 24 + 18/u = 50

32 + 18/u = 50

18/u = 50-32

18/u = 18

18 = 18u

1 = u

u=1 , u≠0

u=1

33.

(12-3 +3÷3) z +1 = 41

(12-3+1 ) z+1 = 41

10z + 1 = 41

10z = 41 -1

10z = 40

z = 4

34.

6× 9 - o +10 = 29-1

54 - o + 10 = 28

64 - o = 28

-o = 28 - 64

- o = - 36

o = 36

35.

33 ÷ ( r + 19 ) = 1

33 / ( r+19) = 1

33 = r +19

r = 14

.......