Răspuns :
100:4=250(sfertul)
25+25=50
50+25=75
75x3=225
225-90=135(rezultatul)
{[(100:4)+(100:4)]+25}x3-90=135
25+25=50
50+25=75
75x3=225
225-90=135(rezultatul)
{[(100:4)+(100:4)]+25}x3-90=135
{[(1000:4+100:4)+25]x3}-90=
{[(250+25)+25]x3}-90=
(300x3)-90=
900-90=810
{[(250+25)+25]x3}-90=
(300x3)-90=
900-90=810