Решить уравнение. 
y:(1.298-998)=4; y:(1.098-998)=4; (1.098-998):y=4.
Пример решения: 
1.300 - (b-678)=400
b-678=1.300-400
b-678=900
b=900+678
b=1.578
1.300 - (1.578-678)=400=400
Ответ: b=1.578
Первый - лучший 
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