Question

8a+8ab-5a+5b если а=1/8 b=-3/4

Answer 1

... =1-3\4-5\8+5-3\4=6-17\8=31\8=3,875

Answer 2

To evaluate the expression 8a + 8ab - 5a + 5b when a = 1/8 and b = -3/4, simply substitute the values of a and b into the expression and perform the arithmetic.

Given: a = 1/8 and b = -3/4

Expression: 8a + 8ab - 5a + 5b

Now, let's plug in the values:

8(1/8) + 8(1/8)(-3/4) - 5(1/8) + 5(-3/4)

Now simplify step by step:

1 + (8 * 1/8 * -3/4) - 5/8 - (15/4)

1 - 3/4 - 5/8 - 15/4

Now, let's find a common denominator to combine the fractions:

1 - (6/8) - (5/8) - (30/8)

Now, combine the fractions:

1 - (6 + 5 + 30)/8

1 - 41/8

To simplify further, we can convert 1 to 8/8:

8/8 - 41/8

Now, subtract the fractions:

(8 - 41)/8

-33/8

So, the expression 8a + 8ab - 5a + 5b, when a = 1/8 and b = -3/4, evaluates to -33/8.