解答

解答

2.⑴
x + y = 4y + 12…①
(x - 4) + (y - 4) = 5(y - 4)…②

2.⑵
① => x - 3y = 12…③
② => x - 4y = -12…④
③-④ y = 24
x = 84
x + y = 108

1.
令餅乾長x cm 寬y cm
2x + 6y = 36…①
6x + 2y = 44…②

① => x + 3y = 18…③
② => 3x + y = 22…④
③*3 - ④ 8y = 32
=> y = 4
x = 6
xy = 24

5.⑴
x - (10y + 1) = 230…①
x - (y-1)/10 = 736…②

5.⑵
① => x - 10y = 231…③
② => 10x - y = 7359…④
④ - ③*10 99y = 5049
=> y = 51
x = 741
x - y = 690

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