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2. Fpb 25, 40 25=5^2 40=2^3x5. fpb=5. jadi banyaknya anak yg menerima sebanyak 5 anak.
3. a. 1/2, 2/3, 5/4, 4/5, 3/7
b. 1/3, 2/5, 3/5, 3/6, 4/7
4. (5p-r)+q= 5(-3)-2+(-4) = -15-(2)+(-4)=-17
5. -6,739
6. a.3x-4<11 =3x<11+4 =3x<15 x<5
b. x+14>21 =x>21-14 = x>7