ПОМОГИТЕ РЕШИТЬ СИСТЕМУ УРАВНЕНИЙ СПОСОБОМ ПОДСТАВКИ :1) Х:3- У:2= -3. Х:2 + У:5 =5; 2)Х:5 - У:3= -0,6. Х:4 +У:6=1 .3) Х:4+У:8= 2. 2Х:9 +У:6=2; 4) 7х:3 -У:9 =4 ; 8х:5 -У:30=3
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