It is known that 1 / 5 = 1 / A + 1 / B, a and B are non-zero natural numbers, and the minimum value of a + B is () a 36 B 40 C 45 D 50

It is known that 1 / 5 = 1 / A + 1 / B, a and B are non-zero natural numbers, and the minimum value of a + B is () a 36 B 40 C 45 D 50

1/5=1/6+1/30
1/5=1/10+1/10
If two values are required to be different, it is 36. If not, it is 20. Here is a small formula: 1 / a = 1 / (a + 1) + 1 / (a (a + 1))

It is known that: (A / 1 + B / 1 + C / 1 + D / 1) + 36 / 1 + 45 / 1 = 1, a B C D is four continuous natural numbers, what is the sum of ABCD?

Let a, B, C and d be x, x + 1, x + 2, x + 3 1 / x + 1 / (x + 1) + 1 / (x + 2) + 1 / (x + 3) + 1 / 36 + 1 / 45 = 1 1 1 / x + 1 / (x + 1) + 1 / (x + 2) + 1 / (x + 3) = 19 / 20. The solution is: x = 3, so a = 3, B = 4, C = 5, d = 6, a + B + C + D = 3 + 4 + 5 + 6 = 18

It is known that 1 / 5 is equal to 1 / A + 1 / b. A and B are non-zero natural numbers. The minimum value of a + B is () a 36 B 40 C 45 D 50
1. It is known that 1 / 5 is equal to 1 / A + 1 / B, a and B are non-zero natural numbers, and the minimum value of a + B is ()
A 36 B 40 C 45 D 50
2. If there are five scores which differ by a quarter in turn, and their ratio is 1:3:5:7:9, then the sum of the five scores is ()
3. Simple calculation (14.7 × 0.78 + 14.7 × 1.02-14.7 × 0.8) △ 7.35 =

1. It is known that 1 / 5 is equal to 1 / A + 1 / B, a and B are non-zero natural numbers, and the minimum value of a + B is (a)
A 36 B 40 C 45 D 50
2. If there are five scores which differ by a quarter in turn, and their ratio is 1:3:5:7:9, then the sum of these five scores is (1 / 2)
3. Simple calculation (14.7 × 0.78 + 14.7 × 1.02-14.7 × 0.8) △ 7.35
=14.7×（0.78+1.02-0.8）÷7.35
=14.7×1÷7.35
=2