① The product of the sum of two continuous natural numbers multiplied by the difference is 135. The two natural numbers are () () ② The quotient of the sum of 7 / 12 / 5 and 1 / 6 divided by 4 minus 7 / 8 is () ③ If a is divided by B, the quotient is 6.983. If the divisor and divisor are expanded by 7.8 times, the quotient is () ④ The number a is 300, 3 / 4 of the number B is a, and the number C is 20% of the number B. the average of the three numbers is ()

① The product of the sum of two continuous natural numbers multiplied by the difference is 135. The two natural numbers are () () ② The quotient of the sum of 7 / 12 / 5 and 1 / 6 divided by 4 minus 7 / 8 is () ③ If a is divided by B, the quotient is 6.983. If the divisor and divisor are expanded by 7.8 times, the quotient is () ④ The number a is 300, 3 / 4 of the number B is a, and the number C is 20% of the number B. the average of the three numbers is ()

1. Let a natural number be x and the other be x + 1, then: (x + X + 1) · (x + 1-x) = 135, and the solution is x = 67 and the other is 68
2. To change the band fraction into false fraction is: (67 / 12 + 7 / 6) / (32 / 8-23 / 8) = 6
3. A / b = 6.983 are expanded, can be reduced points, quotient or 6.983
4. Let B be x, C be y 3 / 4x = 300, x = 400, 20% x = y, y = 80, average = (300 + 400 + 80) / 3 = 260

The product of two adjacent natural numbers is 1260. What are the two natural numbers?
It is solved by a linear equation of one variable,

Let one be x and the other be x + 1,
X(X+1)=1260
X²+X-1260=0
(X-35)(X+36)=0
X=35
X+1=36
A: the two natural numbers are 35 and 36

There are two natural numbers a and B. If you increase a by 6 or B by 4, the product increases by 48. What is the product of the two numbers?

6B=48,B=8
4A=48,A=12
AB=8x12=96