以下哪個是代數式？, 3x + 2 = 20, x + y, 3 + 2, 5 - 1, 哪個代數式表示“x的三倍減去5”？, 5x - 3, x - 5, 3x - 5, 3 - 5x, 如果x=2，求3x+4的值。, 6, 8, 12, 10, 以下哪個不是代數式？, 5z = 25, x + 7 = 10, 2y - 1 =19, 7 + 3 = 10, 如果y=3，求2y-1的值。, 7, 5, 3, 1, 以下哪個代數式表示“b的兩倍加上5”？, 2b + 5, 5b + 2, b + 5, 2 + 5b, 如果c=5，求c-3的值。, 8, 2, 3, 5

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