Question

Thực hiện phép tính:

a) \(9{{\rm{x}}^3}{y^6} + 4{{\rm{x}}^3}{y^6} + 7{{\rm{x}}^3}{y^6}\)                                                  b) \(9{{\rm{x}}^5}{y^6} - 14{{\rm{x}}^5}{y^6} + 5{{\rm{x}}^5}{y^6}\)

Answer 1

a) \(9{{\rm{x}}^3}{y^6} + 4{{\rm{x}}^3}{y^6} + 7{{\rm{x}}^3}{y^6} = \left( {9 + 4 + 7} \right){x^3}{y^6} = 20{{\rm{x}}^3}{y^6}\)

b) \(9{{\rm{x}}^5}{y^6} - 14{{\rm{x}}^5}{y^6} + 5{{\rm{x}}^5}{y^6} = \left( {9 - 14 + 5} \right){x^5}{y^6} = 0\)