Resolvendo livro de matemática (Intermediate Algebra) - Parte 38

-10 + 13 = 3
13 - 10 = 3
14 - 19 = -5
v1 = 14
v2 = 19
19 - 14 = 5
10)
(-5)(2,2) = -11
11)
(5/7)(-14/15) = -70/105
(5/7)(-14/15) = -14/21
(5/7)(-14/15) = -2/3
12)
(-5|1/4)(-8/3) =
5|1/4 = 5 + 1/4
5|1/4 = 20/4 + 1/4
5|1/4 = 21/4
(-21/4)(-8/3) = *
= *
*
(-5|1/4)(-8/3) = 14
Ex4
c)
(-3|1/3)(-3/10) =
3|1/3 = 3 + 1/3
3|1/3 = 9/3 + 1/3
3|1/3 = 10/3
(-10/3)(-3/10) = 1
13)
b
14)
c
Ex5
b)
= = 16/24
16/24 = 2/3
c)
3|1/10 ÷ (-2/5) =
3|1/10 = 3 + 1/10
3|1/10 = 30/10 + 1/10
3|1/10 = 31/10
a: 1/a
2/5: 1/(2/5)
= *
2/5: 5/2
3|1/10 ÷ (-2/5) =
(31/10)(-5/2) = -31/4
15)
(42)/(-2) = -21
16)
(-28)/(-4) = 7
17)
(-1)/(-2) = 1/2 = 0,5
18)
-2/3 ÷ 4 =
(-2/3)(1/4) = -1/6
Ex6
a)
5³ = 5*5*5
5³ = 125
b)
(-2)4 = 16
c)
-24 = -16
19)
2³ = 8
20)
(-10)² = (-10)(-10) = 100
21)
-10² = -100
22)
(-3/4)³ = (-3/4)(-3/4)(-3/4)
(-3/4)³ = -27/64
(-3)³/(4)³ = -27/64