\[\eqalign{ & 3{x^{21}}{y^3}\,\,;\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,0,5{x^2}y\,\,;\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,100x{y^2} \cr & {x^{21}}{y^3}\,\,;\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,3{x^2}y\,\,;\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, - 3x{y^2} \cr}\]
Đề bài
Sắp xếp các đơn thức sau thành từng nhóm đơn thức đồng dạng:
\[\eqalign{ & 3{x^{21}}{y^3}\,\,;\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,0,5{x^2}y\,\,;\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,100x{y^2} \cr & {x^{21}}{y^3}\,\,;\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,3{x^2}y\,\,;\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, - 3x{y^2} \cr}\]
Lời giải chi tiết
Nhóm 1: \[3{x^{21}}{y^3}\,;{x^{21}}{y^3}\,\]
Nhóm 2: \[0,5{x^2}y;\,3{x^2}y\]
Nhóm 3: \[100x{y^2};\, - 3x{y^2}.\]