3,12×0.9÷(-0,9)-3,12÷(-0,4)×0.4 по действиям). Created by gruts2. matematika-ru

3.12×0.9÷(-0.9)-3.12÷(-0.4)×0.4= 3.12×0.9÷(-0.9)=3.12- 3.12÷(-0.4)×0.4=3.12-3.12=0