2,8x10 to the power of 12.

3、20 1 1。 Because the second power of X+negative 1 power x=0, the left and right sides of the equation are multiplied by X at the same time to get the third power of X+1=0, so x= negative 1. So the final value is 20 1 1.

4, (1)4, (2) 1/2, open the brackets on the left of the two equations, then add the two equations to get 2 times (square of a+square of 2 times b) =8, and then divide the two sides of the equation by 2 to get square of a+square of b =4. . . Then bring the square of A+the square of +B = 4 into any equation to get ab= 1/2. .

5、7.。 . . . The square of both sides of x+y+z =5, and the square of x+y+the square of z +2 times (xy+xz+yz)=25. Because xy+xz+yz=9, the result of bringing in 9 is 7.

6. Decompose the original equation into (square of x-2x+1)+(square of y+2y+1)+1,and get the square of (square of x- 1) +y+ 1 after sorting. . . Because all squares are positive numbers, and 1 is also positive numbers, no matter what numbers X and Y take, the result is positive. .