[tex](b + 9) \times 2.05 = 200.9 \\ b + 9 = 200.9 \div 2.05 \\ b + 9 = 20090 \div 205 \\ b + 9 = 98 \\ b = 98 - 9 \\ b = 89[/tex]
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[tex](b + 9) \times 2.05 = 200.9 \\ b + 9 = 200.9 \div 2.05 \\ b + 9 = 20090 \div 205 \\ b + 9 = 98 \\ b = 98 - 9 \\ b = 89[/tex]
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Обьяснение:
20090:205=98
98-9
89