1. The difference between the square + 3 of the polynomial 2Ab AB and the square + 3ab-1 of the polynomial 2Ab AB is ()

1. The difference between the square + 3 of the polynomial 2Ab AB and the square + 3ab-1 of the polynomial 2Ab AB is ()

The difference between the square + 3 of the polynomial 2Ab AB and the square + 3ab-1 of the polynomial 2Ab AB is (- the square of 3AB AB + 4)
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-One third of the square of X + 2x-1 when x = m, the value of the first term is 1. When x = m, the value of the polynomial?

Because when x = m, the value of the first term is 1,
So 2m = 1, M = 1 / 2
When x = m, x = 1 / 2
One third of the square of X + 2x-1
=1/12+1-1
=1/12

If A-B = 13, a & # 178; - B & # 178; = 39, a & # 178; + B & # 178; + 2Ab=____ .

If A-B = 13,
A-B = 39
（a+b)（a-b)=39
13（a+b)=39
a+b=39/13=3
So, (a + b) ^ 2 = 3 ^ 2 = 9