Question

Va rog mult rezolvati-mi și mie ex 12. Dau coroana

Answer 1

12.
a) 10/16 × 4/5 =5/8 × 4/5 =4/8=1/2
b) 21/19 :(-3/38)=21/19 ×(-38/3)=-21/19 ×38/3=-(7×3)/19 ×(2×19)/3=-14
c) 4,5 ×2,3=10,35
d) -0,7 × 1,(6)=-7/10 × (16-1)/9=-7/10 × 15/9=-7/10 × 5/3=-7/6
e) 3,17:(-0,317)=317/100 :(-317/1000)=-317/100 ×1000/317=10
f) 4/5 ×(4/5)²=(4/5)³=64/125
g) (2,5)⁶:(2,5)⁴=(2,5)²=6,25
h) (-1,2)⁷:(-1,2)⁶=-(1,2)⁷:(1,2)⁶=-1,2
i) (3/4)⁻²=(4/3)²=16/9
j) (0,0001)⁻¹⁰⁰=(1/10000)⁻¹⁰⁰=(10⁴)¹⁰⁰=10⁴⁰⁰
k)(2/3)×(2/3)²×(2/3)³ : (-2/3)⁶=(2/3)⁶: (2/3)⁶=1
l) (1/10)¹⁵ × (1/1000)⁻⁶=1/10¹⁵× (10³)⁶=1/10¹⁵× 10¹⁸=10³=1000