ข้อใดเป็นจำนวนเฉพาะ, 7, 9, 8, 10, ข้อใดเป็นจำนวนเฉพาะ, 55, 81, 66, 11, 52=?, 26, 10, 25, 76, 122=?, 123, 156, 146, 144, √121, 12, 11, 64, 25, √144, 5, 4, 3, 12, −20+6 =, −14, −15, 14, 15, 40-(−2)=, 36, 35, 38, 25, 75+1x=90 x=?, 8, 5, 15, 3, 15*x=30 x=?, 2, 4, 3, 5

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