1、（-2x）·（3x-1）-（x-1）^2 2、（x-y+1）^3·（y-x-1）^2·（x-y+1）^n+1 3、（-2）^3÷2^5÷（-1/2）^2+（-2）^2 4、(x-2y)(x+2y)-（x-2y）^2

1、（-2x）·（3x-1）-（x-1）^2 2、（x-y+1）^3·（y-x-1）^2·（x-y+1）^n+1 3、（-2）^3÷2^5÷（-1/2）^2+（-2）^2 4、(x-2y)(x+2y)-（x-2y）^2

1. The original formula = (X-Y + 1); (X-Y + 1); (X-Y + 1) \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\and

Complete the complete square form and write it in the form of square
a^4+10a^2+_____ =____________
1-_____________ +4n^2=__________

a4+10a2+25=(a2+5)2 1-4n+4n2=(2n-1)2

The first [number] followed by a power is a number
① 49 (m-n) 2-9 (M + n) 2 power
② (x2-2) 2-14 (x2-2) + 49
③ A (x2 + 2XY + Y2) - B (x2-y2)
④ 1 / 2 × a3-4a2 + 8A
⑤ 1 / 3 × a 2 power x 4 power - 3B 2 power y 6 power
⑥ (A2-1) 2 + 6 (1-a2) + 9
Come on, tonight!

^2 for the square ^ 3 for the cube
① 49 (m-n) 2-9 (M + n) 2 power
=(7m-7n+3m+3n)(7m-7n-3m-3n)
=(10m-4n)(4m-10n)
=4(5m-2n)(2m-5n)
② (x2-2) 2-14 (x2-2) + 49
=(x^2-2-7)^2
=(x^2-9)^2
=(x+3)^2(x-3)^2
③ A (x2 + 2XY + Y2) - B (x2-y2)
=a(x+y)^2-b(x+y)(x-y)
=(x+y)(ax+ay-bx+by)
④ 1 / 2 × a3-4a2 + 8A
=a/2(a^2-8a+16)
=a/2(a-4)^2
⑤ 1 / 3 × a 2 power x 4 power - 3B 2 power y 6 power
=1/3(a^2x^4-9b^2y^6)
=1/3(ax^2+3by^3)(ax^2-3by^3)
⑥ (A2-1) 2 + 6 (1-a2) + 9
=(a^2-1-3)^2
=(a^2-4)^2
=(a+2)^2(a-2)^2