【1.(2a^2b)·(-1/2ab^2)^32.(-2/5xy^2z)·(-1/2y^2z^2)3.(2x)^3·y^3÷(16xy^2)4.(-a^2b)^4÷(-1/2ab^2)5.-2x^2y(3xy^2z-2y^2z)6.(-2/3a)(1/2a^2+1/6a+1/4)7.(x-3y)(x-1/2y)8.(-a-3b)(7a+2b)9.(9x-2y)(x+y)10.(-1/3p+1/2p)(-2/3p-1/4p)11.(-1/5a^3x^4-9/10a^2x^3)÷(-3/5】

　　1.(2a^2b)·(-1/2ab^2)^3

　　2.(-2/5xy^2z)·(-1/2y^2z^2)

　　3.(2x)^3·y^3÷(16xy^2)

　　4.(-a^2b)^4÷(-1/2ab^2)

　　5.-2x^2y(3xy^2z-2y^2z)

　　6.(-2/3a)(1/2a^2+1/6a+1/4)

　　7.(x-3y)(x-1/2y)

　　8.(-a-3b)(7a+2b)

　　9.(9x-2y)(x+y)

　　10.(-1/3p+1/2p)(-2/3p-1/4p)

　　11.(-1/5a^3x^4-9/10a^2x^3)÷(-3/5ax^2)

　　12.(-2πr^2h+3πrh^2)÷(1/2πrh)