Question

уравнения:-5*(3а+1)-11=-16; -3,2х+4,8=-2*(1,2х+2,4); -5*(0,8х-1,2)=-х+7,2

Answer 1

-5*(3а+1)-11=-16

-15a-5-11=-16

-15a=-16+5+11

-15a=0

a=0

 

 

-3,2х+4,8=-2*(1,2х+2,4)

-3,2x+4,8=-2,4x-4,8

-3,2x+2,4x=-4,8-4,8

-0,8x=-9,6

x=12

 

 

 -5*(0,8х-1,2)=-х+7,2

-4x+6=-x+7,2

-4x+x=7,2-6

-3x=1,2

x=-0,4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Answer 2

I can help you solve these equations. Here are the steps and the answers:

- For the first equation, $$-5*(3a+1)-11=-16$$, we can simplify it by using the distributive property of multiplication:

$$-15a-5-11=-16$$

Then we can add 16 to both sides and simplify again:

$$-15a-16=-16+16$$ $$-15a=0$$

Finally, we can divide both sides by -15 and get the value of a:

$$\frac{-15a}{-15}=\frac{0}{-15}$$ $$a=0$$

- For the second equation, $$-3.2x+4.8=-2*(1.2x+2.4)$$, we can also use the distributive property of multiplication to expand the right side:

$$-3.2x+4.8=-2.4x-4.8$$

Then we can subtract 4.8 from both sides and simplify:

$$-3.2x+4.8-4.8=-2.4x-4.8-4.8$$ $$-3.2x=-2.4x-9.6$$

Next, we can add 2.4x to both sides and simplify again:

$$-3.2x+2.4x=-2.4x+2.4x-9.6$$ $$-0.8x=-9.6$$

Finally, we can divide both sides by -0.8 and get the value of x:

$$\frac{-0.8x}{-0.8}=\frac{-9.6}{-0.8}$$ $$x=12$$

- For the third equation, $$-5*(0.8x-1.2)=-x+7.2$$, we can also use the distributive property of multiplication to expand the left side:

$$-4x+6=-x+7.2$$

Then we can add x to both sides and simplify:

$$-4x+x+6=-x+x+7.2$$ $$-3x+6=7.2$$

Next, we can subtract 6 from both sides and simplify again:

$$-3x+6-6=7.2-6$$ $$-3x=1.2$$

Finally, we can divide both sides by -3 and get the value of x:

$$\frac{-3x}{-3}=\frac{1.2}{-3}$$ $$x=-0.4$$

I hope this helps you understand how to solve these equations. If you have any other questions, feel free to ask me.Ответь+подробно.+уравнения:-5*(3а+1)-11=-16;+-3,2х+4,8=-2*(1,2х+2,4);+-5*(0,8х-1,2)=-х+7,2