2526-36 * 42 / 27 what can be calculated simply should be calculated simply 2526-36*42/27

2526-36 * 42 / 27 what can be calculated simply should be calculated simply 2526-36*42/27

2526-36*42/27 =2526-4*9*3*14/（9*3） =2526-4*14 =2526-56 =2470

（-42.75）*（-27.36）-（-72.64）*（+42.75）=?

-42.75(-27.36-72.64)=-42.75*(-100)=4275

Why are 42, 36, 31, 27 and 24 arithmetic sequences
Isn't it necessary to have a tolerance D for arithmetic sequence? I think D should be a certain number, but d here is variable. Why

This kind of sequence is the second order arithmetic sequence
That is: 6543 is equal difference

The remainder of a natural number divided by 70125361 is a + 19, a, 2A respectively. Find the value of this natural number and a
Easy
What pupils can understand

Let this natural number be x, then 70 = MX + A + 5, that is, 65 = MX + A, 125 = NX + A, 361 = PX + 2a, we get: 125-70 = (n-m) x - 5, 60 = (n-m) x, 361-70 * 2 = (p-2m) X-5, 226 = (p-2m) x, 361-125 * 2 = (p-2n) x, 111 = (p-2n) x, so x is the common divisor of 66226111