1. ВЫЧИСЛИ УДОБНЫМ СПОСОБОМ:
(55+97)+3=
17+24+38+52+6=
(183+17)+345=
425+(75+143)
(129+74)-29=
(863+471)-371=
(119+281)-300=

2. ВЫЧИСЛИ РАЗНЫМИ СПОСОБАМИ:
(680+270)+730=
(950+360)-150=
546-(246+70)=

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