There are four numbers. The first three numbers form an equal difference sequence, and the last three numbers form an equal ratio sequence. The sum of the first and last two numbers is 7, and the sum of the middle two numbers is 6,

There are four numbers. The first three numbers form an equal difference sequence, and the last three numbers form an equal ratio sequence. The sum of the first and last two numbers is 7, and the sum of the middle two numbers is 6,

In general, when three numbers are equal difference sequence, the three numbers are set as A-D, a, a + D. when three numbers are equal ratio sequence, the three numbers are set as a / Q, a, a / Q. next, I'll use the first method to solve the problem. Please use the second method to calculate again. The first three numbers are. A-D, a, a + D. because the last three numbers are equal ratio sequence, so the second method is