Question

СРОЧНООО!!!СПАСИТЕ! 1)(-0,25 - 3/4 + 1/2) * (-0,2) + 3,9 2)(4,3-7,8)*(-5,6+8,2)= 3)4/15*(-5/8)=

Answer 1

1)=-0.5*(-0,2)+3,9=4
2)=-3.5*2.6=-9.1
3)=1/3*(-1/2)=-1/6

Answer 2

1) (-0,25 - 3/4 + 1/2) * (-0,2) + 3,9 = (-1/4 - 3/4 + 2/4) * (-1/5) + 39/10 = -2/4 * (-1/5) + 39/10 = 1/10 + 39/10 = 40/10 = 4
2)  (4,3-7,8)*(-5,6+8,2) = -3,5*2,6 = -9,1
3)  4/15*(-5/8) = -20/120 = -1/6

Answer 3

1. Let's solve the expression step by step:

(-0.25 - 3/4 + 1/2) * (-0.2) + 3.9

First, let's simplify the expression within the parentheses:

-0.25 - 3/4 + 1/2 = -0.25 - 0.75 + 0.5 = -1.5

Now we can substitute the simplified value back into the original expression:

(-1.5) * (-0.2) + 3.9

Multiplying -1.5 by -0.2 gives us 0.3:

0.3 + 3.9 = 4.2

Therefore, the value of the expression is 4.2.

2. Similarly, let's solve the expression step by step:

(4.3 - 7.8) * (-5.6 + 8.2)

First, let's simplify the expression within the parentheses:

4.3 - 7.8 = -3.5 -5.6 + 8.2 = 2.6

Now we can substitute the simplified values back into the original expression:

(-3.5) * (2.6)

Multiplying -3.5 by 2.6 gives us -9.1:

-9.1

Therefore, the value of the expression is -9.1.

3. Let's solve the expression step by step:

4/15 * (-5/8)

To multiply fractions, we multiply the numerators together and the denominators together:

(4 * -5) / (15 * 8)

The numerator becomes -20, and the denominator becomes 120:

-20/120

This fraction can be simplified by dividing both the numerator and the denominator by their greatest common divisor, which is 20:

-1/6

Therefore, the value of the expression is -1/6.