Question

Urgent ex 8.dau 30 de stele si coroana

Answer 1

8.
a)(-2/3)^2 + 18 =
4/9 + 18 =
(4×2+18×9)/9 =
(8+162)/9 =
170/9
b)2^2 × 27/8 + 3^2×(1-3-9)/2^3×(4-2-1) =
27/2 - 99/8 =
(27×4-99)/8 =
(108-99)/8 =
9/8
c)(1/4 × 3/2 - 1/9) × 8/19 - (37/18 - 7/4) × 36/25 =
(3/8 - 1/9) × 8/19 - (37×2-7×9)/36 × 36/25 =
(3×9-1×8) × 8/19 - (74-63)/25 =
8 - 11/25 =
(8×25-11)/25 =
189/25
d)1/225 × (-90)^2 =
1/225 × 8100 =
36