выполни действие и найди неизвестное 1) 789+ =20*30+9 2) -4340:10=897-203 3)(348+474)- =40*20 4) +13*50=847+925
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1) 789+ х =20*30+9789+ х =609
х=789-609= 180
2) х -4340:10=897-203
х-434=694
х=694+434=1128
3)(348+474)- х =40*20
822-х=800
х=22
4) х +13*50=847+925
х+650=1772
х=1772-650=1122