(1)(x3-3x2)×(-2)÷x2+2x=-2(x3-3x2)÷x2+2x=-2(x-3)+2x=-2x+6+2x=6;
(2)设在“÷( )”中括号内为A,
则[(2y)2-10y]÷A+4y=10,
[(2y)2-10y]÷A=10-4y
A=[(2y)2-10y]÷(10-4y)
=y(4y-10)×(-
)1 4y?10
=-y.
故答案为:6,(x3-3x2)×(-2)÷x2+2x=-2(x3-3x2)÷x2+2x=-2(x-3)+2x=-2x+6+2x=6;-y,[(2y)2-10y]÷(10-4y)=-y.