Formula, conversion and unit conversion of primary school mathematics ditto.

Formula, conversion and unit conversion of primary school mathematics ditto.

1. The number of each copy × the number of copies = the total number of copies △ the number of each copy = the total number of copies △ the number of copies = the number of copies 2. 1 times × the number of copies = the number of multiples △ 1 times = the number of multiples △ the number of multiples = the number of multiples △ the number of multiples △ the number of multiples = the number of multiples △ the number of multiples = the number of multiples △ the number of multiples = the number of multiples △ the number of multiples = the

If the square of a minus 2A minus 1 equals 0, then the square of a plus one square of a equals 0

A-2a-1 = 0 a-2a = 1 a-2a + 1 = 1 + 1 (A-1) = 2 A-1 = ± √ 2 A-1 = √ 2 or A-1 = - √ 2 a = 1 + √ 2 or a = 1 - √ 2