1) (20+х) *10 = 700
(20+х) =700:10
20+х =70
х = 70-20
х = 50
Ответ:50
2) 2 * (х - 40) = 60
(х-40) = 60 : 2
х-40=30
х = 30+40
х = 70
Ответ:70
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1) (20+х) *10 = 700
(20+х) =700:10
20+х =70
х = 70-20
х = 50
Ответ:50
2) 2 * (х - 40) = 60
(х-40) = 60 : 2
х-40=30
х = 30+40
х = 70
Ответ:70