21m² +. 7m = ? ¿ ? ?
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Answer:
When 21m² is divided by 7m, the quotient is 3m and the remainder is 0. When 40 is divided by 1, the quotient is 40 and the remainder is 0.
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=7m×3m+7m
=7m×3m+7m×1
=7m(3m+1)
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