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All the answers to the clever questions in the summer vacation homework of the fifth grade mathematics in primary school
P3。 Let the length of the original square be x, then (x+2.5) 2-x 2 = 40.75 gives x = 6.9 6.9 2 = 47.61.
P5, let the divisor be x26.6-2.66 =12.6 * x =1.9 2.66/1.9 =1.4.