Question

quais são as respostas gente?

Answer 1

a) 3/10xy² - 5/10xy² + 8/10xy² - 1/10xy²

= (3/10 -5/10 +8/10 -1/10)xy²
= 5xy²

b) x=2 y=1
então
5xy² = 5.2.1²
= 10

c) x=0,2  e    y=-0,3
5xy²
5. 0,2 . 0,3²
5.2/10.(3/10)²
10/10 . (9/100)
1 . 9/100
= 9/100