Question

1) 2 1/2+1/7*3,5= 2) (4*10^-6)*(2,2*10^3)=

Answer 1

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Answer 2

Let's solve each of the expressions step by step:

1. $2 \frac{1}{2} + \frac{1}{7} \times 3.5$

Step 1: Convert the mixed fraction to an improper fraction. $2 \frac{1}{2} = \frac{5}{2}$

Step 2: Perform the multiplication. $\frac{1}{7} \times 3.5 = \frac{1}{7} \times \frac{7}{2} = \frac{1}{2}$

Step 3: Add the two results together. $2 \frac{1}{2} + \frac{1}{7} \times 3.5 = \frac{5}{2} + \frac{1}{2} = \frac{6}{2} = 3$

So, $2 \frac{1}{2} + \frac{1}{7} \times 3.5 = 3$.

2. $(4 \times 10^{-6}) \times (2.2 \times 10^{3})$

When you multiply numbers in scientific notation, you multiply the coefficients and add the exponents.

Step 1: Multiply the coefficients. $4 \times 2.2 = 8.8$

Step 2: Add the exponents. $10^{-6} \times 10^{3} = 10^{-6+3} = 10^{-3}$

So, $(4 \times 10^{-6}) \times (2.2 \times 10^{3}) = 8.8 \times 10^{-3}$.

Therefore, the final results are:

1. $2 \frac{1}{2} + \frac{1}{7} \times 3.5 = 3$

2. $(4 \times 10^{-6}) \times (2.2 \times 10^{3}) = 8.8 \times 10^{-3}$