Question

Me ajudem a essa tarefa?.

(-1/5):(-1/7)-(-2/11):(4/5)=
Me ajudem a essa tarefa?.

(-1/5):(-1/7)-(-2/11):(4/5)=

3.(-2/7)+(-9/11):(-3)=

(-7/2).(-3/5)-(1/3):(2/7)=

Obs: São 3 contas, para não fazer confusão.

Answer 1

(-1/5):(-1/7)-(-2/11):(4/5)=
-1/5:-1/7=1/5.7/1 = 7/5 //
(7/5)-(-2/11.5/4)
(7/5)-(-10/44)
(7/5)-(-5/22) => mmc(5,22)=
7/5+5/22

5,22:2
5,11:5
1,11:11
1,1 = 11.5.2=110
154/110+25/110=179/110 //
=============================
3.(-2/7)+(-9/11):(-3)=
-6/7+(-9/11.-1/3)
-6/7+(9/33)
-6/7+9/33 => mmc(7,33)
7,33:3
7,11:7
1,11:11
1,1
11.7.3=231
-198/231+63/231=(-198+63)/231=-135/231 =>-45/77
==========================
(-7/2).(-3/5)-(1/3):(2/7)=
(-7/2.-3/5)=21/10
(1/3.7/2=7/6)
21/10-7/6 = 63/30-35/30=28/30 =>14/15 //