Question

7) 5xy+5x-3xy+2x
8) 4x+y-2(x-3y)
9) x³+x²+x-2x-3x²-5x
10) 2x(x+y)+x²-xy
11) x+y sendo x=1 y=7
12) x²-y³ sendo x=5 y=2
13) 2a²b-3ab sendo a=1 b=4
14) 8a²+5b²:c+d² sendo a=3 b=2 c=10 d=9

Answer 1

Resposta e Explicação passo a passo:

7) 5xy + 5x - 3xy + 2x

= 5xy - 3xy + 5x + 2x

= 2xy + 7x

8) 4x + y - 2(x - 3y)

= 4x + y - 2x + 6y

= 4x - 2x + y + 6y

= 2x + 7y

9) x³ + x² + x - 2x - 3x² - 5x

= x³ + x² - 3x² + x - 2x - 5x

= x³ - 2x² - 6x

10) 2x(x + y) + x² - xy

= 2x² + 2xy + x² - xy

= 2x² + x² + 2xy - xy

= 3x² + xy

11) x + y sendo,  x = 1 e y = 7

= 1 + 7

= 8

12) x² - y³ sendo, x = 5 e y = 2

= 5² - 2³

= 25 - 8

= 17

13) 2a²b - 3ab sendo, a = 1 e b = 4

= 2(1)²(4) - 3(1)(4)

= 8 - 12

= - 4

14) 8a² + 5b²:c + d² sendo, a = 3, b = 2, c = 10 e d = 9

= 8(3)² + 5(2)²/10 + 9²

=8(9) + 5(4)/10 + 81

= 72 + 20/10 + 81

= 72 + 2 + 81

= 155

Answer 2

Explicação passo-a-passo:

5xy+5x-3xy+2x

5xy-3xy+5x+2x

2xy+7x

4x+y-2(x-3y)

4x+y-2x+6y

4x-2x+y+6y

2x+7y

x³+x²+x-2x-3x²-5x

x³+x²-3x²+x-2x-5x

x³-2x²-x-5x

x³-2x²-6x

2x(x+y)+x²-xy

2x²+2xy+x²-xy

2x²+x²+2xy-xy

3x²+xy

x+y sendo x=1 y=7

1+7

8

x²-y³ sendo x=5 y=2

5²-2³

25-8

17

2a²b-3ab sendo a=1 b=4

2×1²×4-3×1×4

2×1×4-3×1×4

2×4-3×4

8-12

-4

8a²+5b²:c+d² sendo a=3 b=2 c=10 d=9

8×3²+5×2²÷10+9²

8×9+5×4÷10+81

72+20÷10+81

72+2+81

74+81

155