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1) 12*40=480(м.)
2)8*30=240(м.)
3)480+240=720(м.)- всего
4)720-340=380(м.)- осталось
ответ: осталось 380 метров материи.
так же можно записать одним выражением:
(12*8)+(8*30)-340=380(м.)
ответ:осталось 380 метров материи.
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