Question

（x-3y)（4x+3y）-（2x-3y）^2

Answer 1

（x-3y)（4x+3y）-（2x-3y）²
=4x²+3xy-12xy-9y²-2x²-6xy+3y²
=2x²-15xy-6y²
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追问

3Q

追答

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追问

（n-2n）（m^2-4n^2）（m+2n）

追答

(m+2n)^2(m-2n)^2
=(m+2n)(m-2n)^2
=（m^2-4n^2）^2
=m^4-8m^2n^2+16n^4

追问

4(a-b)^2-(2a+b)(a-2b)

追答

4(a-b)²-(2a+b)(a-2b)

=4（a²-2ab+b²）-2a²-4ab+a²-2b²
=4a²-8ab+2b²-2a²-4ab+a²-2b²
=3a²-12ab

追问

(-2)^0+(-1/2)^-1+(1/10)^-1+(1/3)^-2+(1/2)^6

追答

(-2)^0+(-1/2)^-1+(1/10)^-1+(1/3)^-2+(1/2)^6

=1+1/4+1/10+1/9+1/72
=1.475

Answer 2

解：(x--3y)(4x+3y)--(2x--3y)^2
=4x^2--12xy+3xy--9y^2--4x^2+12xy--9y^2
=3xy--18y^2.

Answer 3

=4x^2-9xy-3y^2-(4x^2-12xy+9y^2)
=-12y^2-3xy