Question

(500+a)-100=70 a-(211+134) =654

Answer 1

(500+a)-100=70

500+a=70+100

500+a=170

a=170-500

a= -330

Verificare: 500-330-100=170-100 (+ si cu - sa stii mereu ca da minus)

                                      =70

 a-(211+134) =654

 a-345=654

a=345+654

a=999

Verificare: 999-(211+134) =999-345

                                          = 654

Sper ca te-am ajutat !