判斷是否是代數, 9+8, 7+6, 8+8, 5+9, 8+Q, 7-6, 判斷是否是代數, 8+11, 8-x, 9十1, 1+3, 3+8, 7+8, 判斷是否是代數, 1+9, 13+27, 83-8, 76+89, 18+28, 7x-2, 判斷是否是代數, 16-7, 34+72, 381-82, 1x+6, 2+7, 32-6, 判斷是否是代數, 15+2, 3-1x, 62+8, 27-8, 234-12, 763+76, 判斷是否是代數, 943-110, 828+23, 376+37, 638-286, 3+6x, 736-87.

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