39/1
(39 x 26) + (39 x 13) = 39 x 39 = 1521
The factor pairs of 39 are 1 x 39 and 3 x 13
39.273 = 39 x 778 = 39 x 2
If that's -10x - 39, the answer is (x - 13)(x + 3) If that's +10x - 39, the answer is (x + 13)(x - 3)
Best estimate is 20 x 40 = 800 Actual answer is 22 x 39 = 858
The closest estimate for the product of 2 x 19 x 5 equals 200.
The closest estimate is, of course, the exact value.
858
30 x 400 = 12000
60 x 60
Assuming that you can only use each number once, then one solution is :- 6 x (22 - 2 - 39/3) = 6 x (20 - 13) = 6 x 7 = 42
3000 x 20 = 60000
0 x 39 = 0 1 x 39 = 39 2 x 39 = 78 3 x 39 = 117 4 x 39 = 156 5 x 39 = 195 6 x 39 = 234 7 x 39 = 273 8 x 39 = 312 9 x 39 = 351 10 x 39 = 390
39/1
You can estimate the derivative by looking at adjacent rows of the table, and calculate (difference of y-coordinates) divided by (difference of x-coordinates).
39 = 1 x 39, 3 x 13, 13 x 3, 39 x 1.