Question

Nas figuras, calcule o valor de X:

Answer 1

Resposta:

9/x=18/4

18x=36

x=36/18

x=2

10/15=3x+1/5x-2

10(5x-2)=15(3x+1)

50x-20=45x+15

50x-45x=15+20

5x=35

x=35/5=7

Explicação passo-a-passo:

Answer 2

Resposta:

e) x=2

f) x=7

Explicação passo-a-passo:

Teorema de Tales

$a)\\ {x\over4}={9\over18}\\ \\ 18x=4.(9)\\ 18x=36\\ x=36\div18\\ \\ x=2\\ \\ b)\\ {10\over15}={3x+1\over5x-2}\\ \\ 10(5x-2)=15(3x+1)\\ 50x-20=45x+15\\ 50x-45x=15+20\\ 5x=35\\ x=35\div5\\ \\ x=7$