Question

Alguém me ajuda pfvr nessas questões de matemática????? Preciso muito??????

Answer 1

$\frac{3}{2} =\frac{x}{4}$

2x=3×4

2x=12

x=12÷2

x=6

$\frac{x}{4} =\frac{21}{12}$

12x=4×21

12x=84

x=84÷12

x=7

$\frac{9}{x} =\frac{12}{14}$

12x=9×14

12x=126

x=126÷12

x=10,5

$\frac{8}{x} =\frac{9}{12}$

9x=8×12

9x=96

x=96÷9

x≅10,67

$\frac{18}{9} =\frac{4}{x}$

18x=9×4

18x=36

x=36÷18

x=2

$\frac{3x+1}{10} =\frac{5x-2}{15}$

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

45x+15=50x-20

35=5x

x=35÷5

x=7

$\frac{6}{x-5} =\frac{24}{x+1}$

6(x+1)=24(x-5)

6x+6=24x-120

126=18x

x=126÷18

x=7

$\frac{12}{8} = \frac{x+1}{2x-6}$

12(2x-6)=8(x+1)

24x-72=8x+8

16x=80

x=80÷16

x=5