Решите:
(180560+20140)-12098=
(90106-12315)-685=
369+1054+9007=
3917+51235+610089=
Поставьте скобки где надо:
620-420:4+250=300
250+300:30-7=253
120:3•2+30=50
90+48:8:3=28

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