ช่วยแปลโจทย์ให้หน่อยครับ
1.There are two circles, $C$ of radius $1$ and $C_r$ of radius $r$, which intersect on a plain. At each two intersecting point on the circumference of $C$ and $C_r$, the tangent to C and that to $C_r$ from an angle $120^{\circ} $ outside $C$ and $C_r$.
งงตรงประโยคหลังมากๆเลยครับ
2.The total number of subtraction that result remain in 11111 remaining after the a four-digit number has been subtracted from a five-digit number and the digits 1 through 9 have all bean used is .....
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11 พฤษภาคม 2018, 10:39
