Question

1_determine o valor da imcógnita em cada equação:

Answer 1

Resposta:

1) a) x+41=21

x=21-41

x=-20

b)4x+3.(x+2)=15

4×+3x+6=15

7x=15-6

7x=9

x=9÷7

x= aproximadamente 1,2857...

c)5x+3=2x+41

5x-2x=41-3

3x=38

x=38÷3

x= aproximadamente 12,666...

d)6+x=4x-1/3

6+3x=4x-1

3x-4x=6+1

-x=7(-1)

x=-7

e)14+2x=152

2x=152-14

2×=138

x=138÷2

x=69

f)x-23=51

×=51+23

×=74

g)5(×-8)+×=4×-50

5×-40+×=4×-50

6×-4×=-50+40

2×= -10

×= -10÷2

×= -5

2) a)2.(5×-1)= 2.(2×)

10×-2=4×

10×-4×=2

6×=2

×=2÷6

×= aproximadamente 0,333...

b) (5×-1).2×

10×-2×

8×

×=8

3)F=x²-y/2

F=2²-(-2)/2

F=4+2/2

F=6/2

F=3