Resposta :
3x²-1x-7,para x=-5
5
3(-5)^2 - 1.(-5) - 7
5
75 + 1 - 7
69
a+b, para a=1/2 e b=1/3
1-ab
1 + 1 mmc = 6
2 3
3 + 2 = 5
6 6
1-ab = 1 - 1 . 1
2 3
1 - 1 = 6 - 1 ==. 5
6 6 6
5 : 5 ==> 5 . 6 ==> 1
6 6 6 5
5
3(-5)^2 - 1.(-5) - 7
5
75 + 1 - 7
69
a+b, para a=1/2 e b=1/3
1-ab
1 + 1 mmc = 6
2 3
3 + 2 = 5
6 6
1-ab = 1 - 1 . 1
2 3
1 - 1 = 6 - 1 ==. 5
6 6 6
5 : 5 ==> 5 . 6 ==> 1
6 6 6 5