200:5-72:2+[651:7×5+(552:6-28)]-189=
200:5-72:2+[651:7×5+(92-28)]-189=
200:5-72:2+(651:7×5+64)-189=
200:5-72:2+(93×5+64)-189=
200:5-72:2+(465+64)-189=
200:5-72:2+529-189=
40-36+529-189=
4+529-189=
533-189=
344
850-900:100-{10×[300:60+(100:10-10)×40]}=
850-900:100-{10×[300:60+(10-10)×40]}=
850-900:100-[10×(300:60+0×40)]=
850-900:100-[10×(5+0×40)]=
850-900:100-[10×(5+0)]
850-900:100-(10×5)=
850-900:100-50=
850-9-50=
841-50=
791
346+[200-(24×4:2)+(465:5-29)]=
346+[200-(24×2)+(93-29)]=
346+(200-48+64)=
346+(152+64)=
346+216=
562