㈠(a^2-b^2)(a^4+a^2•b^2+b^4)-(a^3+b^3)^2=?
㈡-16x^2•y^2+12x•y^5-8x•z^3=?
㈢9m^2-n^2+3m-n=?
㈣12a^3•b^2-9a^b+3a•b^2=?
㈤a^2(b+1)-b^2(a+1)=?
㈥x^4-8x^2+16=?
㈦2x^3+8x^2•y+8x•y^2=?
㈧-3m^3•n^3+81m^6=?
㈨(a+b)^4-3(a+b)^3-18(a+b)^2=?
㈩x^3+(a^3•b^3•x^3)÷8=?