Ответ:
S= a×b. 1 2/5 × 4/7= 7/5×4/7=4/5 м2.
3/4×1/4= 3/16
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Ответ:
S= a×b. 1 2/5 × 4/7= 7/5×4/7=4/5 м2.
3/4×1/4= 3/16