Question

2) Efetue as multiplicações:


a)(+7)•(=1/3)=

b)(-3/5).(-4)=

c) 1/5•(-7/3)•2=

d)-2•(-1/3)•(-5/9)=

e)5•(1-1/2)=

f)(1-2/3)•(2-1/2)

g)(-1+1/2)•(-2-3/4)=

h)(1+1/2-1/3)•(3/2+5)=

i)( -0,3)•(1/5)•(-2)•(3/10)•(-0,1)=

preciso das contas para hoje!!!​

Answer 1

a) (+7)•(-1/3) = (+7)•(-1)/3 = - 7/3  

b) (-3/5).(-4) =  (-3)•(-4)/5 = 12/5

c) 1/5•(-7/3)•2 =  

[1•(-7)•2] = - 14

    5•3          15

d) -2•(-1/3)•(-5/9) =

(-2)•(-1)•(-5) = - 10

    3•9             27

e) 5•(1 - 1/2) =

5•(2/2 - 1/2) =

5•(1/2) =

5•1 = 5

 2      2

f) (1 - 2/3)•(2 - 1/2)  =

(3/3 - 2/3)•(4/2 - 1/2) =

(1/3)•(3/2)

1•3 = 1  

3•2    2

g) (-1 + 1/2)•(-2 - 3/4) =

(-2/2 + 1/2)•(-8/4 - 3/4) =

(-1/2)•(-11/4) =

(-1)•(-11) = 11

 2•4       8

h) (1 + 1/2 - 1/3)•(3/2 + 5) =

(6/6 + 3/6 - 2/6)•(3/2 + 10/2) =

(7/6)•(13/2) =

7•13 = 91

6•2     12

i) (-0,3)•(1/5)•(-2)•(3/10)•(-0,1) =

(-3/10)•(1/5)•(-2)•(3/10)•(-1/10) =

(-3)•1•(-2)•3•(-1) = -  18  

  10•5•10•10        5000

ou

-   9  

2500