(12 × 105) ÷ (3 × 102)

To solve this expression, we can simplify the expression within the parentheses first:

(12 × 105) ÷ (3 × 102)

= (1260) ÷ (306)

Now, we can divide 1260 by 306:

= 4.11764705882

So, (12 × 105) ÷ (3 × 102) is approximately equal to 4.11764705882.

To solve this expression step-by-step, follow the order of operations (PEMDAS/BODMAS):

Step 1: Calculate the multiplication within parentheses.
12 × 105 = 1,260

Step 2: Calculate the multiplication outside the parentheses.
3 × 102 = 300

Step 3: Divide the result from step 1 by the result from step 2.
1,260 ÷ 300 = 4.2 (rounded to one decimal place)

So, (12 × 105) ÷ (3 × 102) = 4.2.