Question

1,2 (4-3а) + 0,4а - 5,8, если а = -5/32

Answer 1

1,2(4-3а)+0,4а-5,8=4,8-3,6а+0,4а-5,8=-1-3,2а
а=-5/32         -1-(3,2*(-5/32)=-1 -(-(32/10*5/32)=-1-(-1/2)=-1+1/2=-1+0
,5=-0,5

Answer 2

To find the value of the expression 1,2 + (4-3a) + 0,4a - 5,8 when a = -5/32, we can substitute -5/32 for "a" in the given expression and simplify it.

Let's start by substituting the value of "a" into the expression:

1,2 + (4 - 3(-5/32)) + 0,4(-5/32) - 5,8

Now, let's simplify the expression step by step:

1,2 + (4 + 15/32) - 2/16 - 5,8

Next, we need to find a common denominator for the fractions:

1,2 + (4 + 15/32) - 1/8 - 5,8

To add the fractions, we need to have a common denominator. Let's convert the whole numbers into fractions with the same denominator:

1,2 = 1 + 0,2 = 1 + 2/10 = 1 + 1/5 = 5/5 + 1/5 = 6/5 5,8 = 5 + 0,8 = 5 + 8/10 = 5 + 4/5 = 25/5 + 4/5 = 29/5

Now, we can rewrite the expression:

6/5 + (4 + 15/32) - 1/8 - 29/5

To simplify further, let's find the least common denominator (LCD) for the fractions:

LCD = 5 * 32 * 8 = 1280

Now, we can rewrite the expression with the common denominator:

(6/5) * (256/256) + (4(32/32) + 15/32) * (40/40) - (1(160/160)) - (29/5) * (256/256)

Simplifying:

(6 * 256 + 4 * 32 + 15 - 160 - 29 * 256) / 1280

Calculating:

(1536 + 128 + 15 - 160 - 7424) / 1280

(-6745) / 1280

Finally, we can divide -6745 by 1280:

-6745 / 1280 = - 5.26875

Therefore, the value of the expression 1,2 + (4-3a) + 0,4a - 5,8, when a = -5/32, is approximately -5.26875.