Toán Lớp 8: Nhân đa thức sau:
(5xy-1).(1/10y^3-2y^2-2/5y)
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Toán Lớp 8: Nhân đa thức sau:
(5xy-1).(1/10y^3-2y^2-2/5y)
Comments ( 2 )
= 5xy.$\frac{1}{10}$y³- 5xy.2y^2 – 5xy.$\frac{2}{5y}$ – 1.$\frac{1}{10}$y³ + 1. 2y^2 + 1.$\frac{2}{5y}$
= $\frac{xy^4}{2}$- 10xy^3 – 2x + $\frac{1}{10}$y³ + 2y^2 + $\frac{2}{5y}$