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The answer to the last question on page 35 of the first volume of the sixth grade mathematics synchronous exercise
Solution: The length of 1/5 increases by 6/5a, and the width of 1/4 increases by 5/4b.

6/5a×5/4b=3/2ab

∴ The area has increased by 3/2ab-ab= 1/2ab.

The circumference increases. Do the math yourself.

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