Question

Registre o produto de cada multiplicação abaixo:

a) (+2/3) • (-1/4)

b) (-5/3) • (+6/5)

c) (-2 1/2) • (-1 6/7)

d) (-0,7) • (0,5)

e) (+0,4) • (-0,2)

f) 2/7 x 2¹/6

g) 2/5 x 3/7

h) 3/9 x 5/9

i) 2/5 x 7/20

j) 4/3 x 3/20

l) 6/14 x 21/16

2) Resolva as expressões abaixo:

a) 2/5 + (-7/2) • (-4/25)

b) (1/6 + 21/3 x 0,5) - 5/6

me ajudem por favor

Answer 1

a) (+2/3) • (-1/4) = 2/3.-1/4

= -2/12...reduzindo

= -1/6

b) (-5/3) • (+6/5) = -5/3.6/5

= -30/30

= -1

c) (-2 1/2) • (-1 6/7) = (-21/2).(-16/7)

= 336/14

= 24

d) (-0,7) • (0,5) = (-7/10).(5/10)

= -35/100

= -0,35

e) (+0,4) • (-0,2) = (4/10).(-2/10)

= -8/100

= - 0,08

f) 2/7 x 2¹/6 = 2/7.2/6

= 4/42

= 2/21

g) 2/5 x 3/7 = 6/35

h) 3/9 x 5/9 = 15/81

= 5/27

i) 2/5 x 7/20 = 14/100

= 7/50

j) 4/3 x 3/20 = 12/60

= 1/5

l) 6/14 x 21/16 = 126/224

= 63/112

2) Resolva as expressões abaixo:

a) 2/5 + (-7/2) • (-4/25) = 2/5 + 28/100....achando m.m.c

= 40/100 +28/100

= 68/100

= 17/ 25

b) (1/6 + 21/3 x 0,5) - 5/6= ( 1/6+ 21/3 . 5/10) - 5/6

= (1/6+ 105/30) - 5/6.....achando o m.m.c dentro.

= ( 5/30+105/30) -5/6

= (110/30) -5/6

= 11/3 -5/6...........achando o m.m.c

= 22/6 -5/6

= 17/6

espero ter ajudado