Cho P=-2xy^3 +10xy-3x62 y; Q=xy-7x^2 y+5xy^3+10xy11/15Cho P=-2xy3+10xy-3x2y; Q=xy-7x2y+5xy3+10xy Tìm M = P-Q7xy3-xy+4x2y-7xy3-xy+4x2y-7xy3-xy-4x2y7xy3-xy-4x2yGiải thích
