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4. √200 , √200
5. 4ส่วน9 , -4ส่วน9
6. 24ส่วน75 , -24ส่วน75
7. 0.4 , -0.4
8. √0.049 , √0.049
อีกสองข้อทำเองนะคะ ทำได้แค่นี้จริงๆ

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