What formula is used for a & # 178; BC + B & # 178; AC + C & # 178; ab =?

What formula is used for a & # 178; BC + B & # 178; AC + C & # 178; ab =?

The extracted common factor = ABC × (a + B + C), a & # 178; BC + B & # 178; AC + C & # 178; ab is not equal to a & # 178; B & # 178; + A & # 178; C & # 178; + B & # 178; C & # 178; ab is not equal to a & # 178; B & # 178; C & # 178;
Without this formula, you can take a special value, a = b = 1, C = 0, you can see that the two are not equal!

Mathematical problems a & # 178; - B & # 178; C & # 178; = B & # 178; - A & # 178; C & # 178; prove Pythagorean theorem in two ways

You have in Baidu Encyclopedia, there are clear analysis, you directly search "Pythagorean theorem" there

What is A-1 / a = 3, a-178; - 1 / a-178?
(if you don't get it back, check it tomorrow) it's a & # 178; + 1 / A & # 178;

Are you sure the title is right?
such
(a-1/a)^2=a^2-2xax1/a+(1/a)^2=3^2=9
a^2+(1/a)^2=9+2=11
It's a plus sign, it's 11