Решите уравнения:
1.(15-x:60)*30=70
2.7 11/15-(x-3 4/15)=2 8/15
3.136-(x+90):4=56
1.(15-x:60)*30=70
2.7 11/15-(x-3 4/15)=2 8/15
3.136-(x+90):4=56
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(15-360:60)*30=270(15-6)*30=2709*30=270270=270
5 3/15+ 3 4/15=8 7/15
Ответ: 8 7/15
(х+90):4=136-56
(х+90):4=80
х+90=80*4
х+90=320
х=320-90
х=230.