李先生有一根长为 26y cm 的铁丝。他用这根铁丝围成了一个长和宽分别为 2y cm 和 2y cm 的长方形。

它不会直接告诉你答案，而是问你卡在哪一步看看 AI 是怎么陪你一步步弄懂这道题的

完整解法

1. Calculate the perimeter of the rectangle formed

Perimeter of rectangle $= 2 \times (2y + 2y) = 2 \times 4y = 8y$ cm

2. Find the length of the remaining wire

Remaining wire $= 26y - 8y = 18y$ cm

答案

$18y$

1. Find the length of the remaining wire from part (a)

Length of remaining wire $= 26y - (2y + 2y + 2y + 2y) = 26y - 8y = 18y$ cm

2. Substitute $y = 4$ into the expression for the remaining wire

Length of remaining wire $= 18(4) = 72$ cm

3. Calculate the length of one side of the square

Length of one side $= 72 \div 4 = 18$ cm

答案

$18$ cm

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