(8+10)•х=450
18•х=450
х=450÷18
х=25т/га
_____
(8+10)•25=450
25т/га
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Решение:
(8+10)•х=450
18•х=450
х=450÷18
х=25т/га
_____
(8+10)•25=450
Ответ:
25т/га