Question

1. target value: 29

$12\times2^2 - 18.4\div0.6$

1. target value: 23

$5^2 - 0.2\times8 + 12\times\frac{1}{2}$

1. target value: 45

$19\div1^5\div\frac{1}{2}+5$

Explanation:

Problem 7: Target value: 29

Step1: Calculate exponent first

$2^2 = 4$

Step2: Multiply 12 by the result

$12 \times 4 = 48$

Step3: Subtract 18.4 from 48

$48 - 18.4 = 29.6$

Step4: Add 0.6 to the result

$29.6 + 0.6 = 30.2$

Problem 8: Target value: 23

Step1: Calculate exponent first

$5^2 = 25$

Step2: Multiply 0.2 by 8

$0.2 \times 8 = 1.6$

Step3: Multiply 12 by $\frac{1}{2}$

$12 \times \frac{1}{2} = 6$

Step4: Subtract 1.6 from 25

$25 - 1.6 = 23.4$

Step5: Add 6 to the result

$23.4 + 6 = 29.4$

Problem 9: Target value: 45

Step1: Calculate exponent first

$1^5 = 1$

Step2: Divide by $\frac{1}{2}$ (multiply by 2)

$1 \div \frac{1}{2} = 1 \times 2 = 2$

Step3: Add 19 and 2

$19 + 2 = 21$

Step4: Add 5 to the result

$21 + 5 = 26$

Answer:

1. For expression $12 \times 2^2 - 18.4 + 0.6$: $30.2$ (does not match target 29)
2. For expression $5^2 - 0.2 \times 8 + 12 \times \frac{1}{2}$: $29.4$ (does not match target 23)
3. For expression $19 + 1^5 \div \frac{1}{2} + 5$: $26$ (does not match target 45)