（x-3y)（4x+3y）-（2x-3y）²=4x²+3xy-12xy-9y²-2x²-6xy+3y²=2x²-15xy-6y²--------------------------------------------------------------------------------------采納是我前...3QYou're welcome.If you feel satisfied, you can click "accept as a satisfactory answer"oh!望采納！（n-2n）（m^2-4n^2）（m+2n）(m+2n)^2(m-2n)^2=(m+2n)(m-2n)^2=（m^2-4n^2）^2=m^4-8m^2n^2+16n^44(a-b)^2-(2a+b)(a-2b)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(-2)^0+(-1/2)^-1+(1/10)^-1+(1/3)^-2+(1/2)^6(-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