Question

2а²-б/б²+1-1/а при а=1 1/2,б=0,5

Answer 1

2×(1,5)^2 - 0,5/0.25 +1 - 1 / 2/3=

2×2.25 -2+1-1,5=4.5+1-2.5=3

Answer 2

To evaluate the expression when а=1/2 and б=0.5, simply substitute these values into the given expression:

Expression: (2а² - б) / (б² + 1) - 1 / а

Substitute а=1/2 and б=0.5 into the expression:

(2 * (1/2)² - 0.5) / (0.5² + 1) - 1 / (1/2)

Now perform the calculations step by step:

(2 * (1/4) - 0.5) / (0.25 + 1) - 1 / (1/2) (2/4 - 0.5) / (0.25 + 1) - 1 / (1/2) (0.5 - 0.5) / (0.25 + 1) - 1 / (1/2) 0 / (0.25 + 1) - 1 / (1/2) 0 / 1.25 - 1 / (1/2)

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

0 / 1.25 - 2 / 2

Next, subtract the fractions:

0 - 2 / 2 -2 / 2 -1

Therefore, when а=1/2 and б=0.5, the expression evaluates to -1.