Question

Calcule o valor numérico das seguintes expressões algébricas: a) 3a-2b-10 para A=6 e B= -3. b) m2+6mn+n2 para M= 2/3 e N= -1/2

Answer 1

A)3a-2b-10                  B)m2+6mn+n2
3.6-2.(-3)-10=                  2/3.2+6.2/3.(-1/2)+(-1/2).2=
12+6-10=                          4/3+12/3.(-1/2)-2/2=
18-10 =                              4/3-12/6-2/2=            mmc:6
8                                        8-12-6=
                                          8-18=
                                          -10