Question

faça 10 equações com mmc e todo o cálculo. pfv me ajudemmm​

Answer 1

1)

$\frac{x}{2}+\frac{x}{3}=15$

$\frac{x}{2}+\frac{x}{3}=15\times{6}\\3x+2x=90\\5x=90\\x=\frac{90}{5}=18$

2)

$\frac{x}{2}+\frac{x}{3}=\frac{5}{6}$

$\frac{x}{2}+\frac{x}{3}=\frac{5}{6}\times6\\3x+2x=5 \\5x=5$

$x=\frac{5}{5}\\x=1$

3)

$\frac{x}{5}-\frac{x}{6}=20$

$\frac{x}{5}-\frac{x}{6}=20\times{30}\\6x-5x=600\\x=600$

4)

$x+\frac{x}{5}=12$

$x+\frac{x}{5}=12\times5\\5x+x=60\\6x=60\\x=\frac{60}{6}=10$

5)

$3x-\frac{x}{2}=10$

$3x-\frac{x}{2}=10\times2\\6x-x=20\\5x=20\\x=\frac{20}{5}=4$

6)

$x-\frac{2x}{5}=9$

$x-\frac{2x}{5}=9\times5\\5x-2x=45\\3x=45\\x=\frac{45}{3}=15$

7)

$\frac{2x}{5}+\frac{5x}{2}=58$

$\frac{2x}{5}+\frac{5x}{2}=58\times10\\4x+25x=580\\29x=580\\x=\frac{580}{29}=20$

8)

$\frac{x}{3}-\frac{x}{2}=-6$

$\frac{x}{3}-\frac{x}{2}=-6\times6\\2x-3x=-36\\-x=-36\times(-1`)\\x=36$

9)

$3x-\frac{2x}{2}=8$

$3x-\frac{2x}{2}=8\times2\\6x-2x=16\\4x=16\\x=\frac{16}{4}=4$

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

$x-\frac{x}{2}=3\times(2)\\2x-x=6\\x=6$