(3 1/4-2 5/21)*(2.7-2.1)

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First, let's simplify the fractions:

3 1/4 = 13/4
2 5/21 = 47/21

Next, let's subtract the fractions:

(13/4 - 47/21) = (273/84 - 188/84) = 85/84

Now, let's subtract the decimals:

(2.7 - 2.1) = 0.6

Finally, let's multiply the two results together:

(85/84) * 0.6 = 0.625

Therefore, (3 1/4 - 2 5/21) * (2.7 - 2.1) = 0.625