Question

Por favor me ajudem.

Answer 1

Resposta:

Explicação passo-a-passo:

1.2-

a) 3 x 4 =12

b) 7 x a = 7a

c) 4 x X2 = 4X2

D) 3 x h = 3h

1.3

a)7a2

b)19X

c) 13y

d)58k

1.4

a)3\cdot \:45x^{3+1}

3\cdot \:45x^4 = 135x^4

b)28\cdot \:7x^{2+1}

28\cdot \:7x^3 = 196x^3

c)\frac{125a}{25a}

\frac{5a}{a} =5

d)\frac{216y^4}{4y^3}

\frac{54y^4}{y^3}

54y^{4-3} = 54y

1.5

a) (x+2y)+(5x-4)=  

x+2y+5x-4

6x+2y-4

b) (7-8x) - (x+2y) =

7-8x-x-2y

7-8x-x-2y

c) (5x-4) - (7-8x) =

5x-4-7+8x

13x-11

d) (x+2y)+(5x-4) + (7-8x)=

x+2y+5x-4+7-8x

-2x+2y-4+7

2y+3-2x