Question

Resolva as seguintes expressões numéricas em forma irredutível

A)(-1/7) • (-2) + (-3/4)
B)(-2/5) • (-25/2) + (-1/4) : (+1/4)=
C)(-3/10) : (-3) - (+5/10)
D)(-4/9) • (-18/10) - (-1/7) : (+1/35)

Answer 1

A) = 2/7 + (- 3/4) = (2 • 4) + (- 3 • 7)= 7 • 4 = - 13/28

B) = (-1 • 2) • (5•-5) + ( - 1/4) : ( + 1/4) = 5 1/4 • 4) = 5+(-1) = 4

C) = (-3/10): (-3) - ( + 5 2.5) = ( -1 • 3 10) • ( 1 3• - 1) - ( + 1/2) = 1/10- ( + 1/2) = 1/10 - (+ 1/2) = 1- 5 5•2 = - 2/5

D) =(- 4/9) • (- 9 • 2/5 • 2) - (-1/7): ( + 1/35) = ( - 4/9) • ( - 9/5) - (-1/7) • ( 7• 5) = ( -4/9) • ( 9 • - 1 5) = 4/5 ( - 5) = 4/5 - (- 5) = 4/5 - (-5) = 4 - ( - 5 •5 5) = 29/5