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a 3*5*6*8*9/6*9*10*4*3=(3/3)*(5/10)*(6/6)*(9/9)*(8/4)=1*1/2*1*1*2=1
b 15*18*20*22/3*5*9*2*11*40=(15/3/5)*(18/9/2)*(20/40)*(22/11)=1*1*1/2*2=1

\(\dfrac{5}{6}:4=\dfrac{5}{6}x\dfrac{1}{4}=\dfrac{5}{24}\)
\(\dfrac{10}{11}-\dfrac{3}{22}=\dfrac{20}{22}-\dfrac{3}{22}=\dfrac{17}{22}\)

a) \(\dfrac{2}{3}+\dfrac{4}{9}=\dfrac{6}{9}+\dfrac{4}{9}+\dfrac{6+3}{9}=\dfrac{10}{9}\)
b)\(\dfrac{1}{10}+\dfrac{2}{5}=\dfrac{1}{10}+\dfrac{4}{10}=\dfrac{1+4}{10}=\dfrac{5}{10}=\dfrac{1}{2}\)
c) \(\dfrac{7}{22}-\dfrac{3}{11}=\dfrac{7}{22}-\dfrac{6}{22}=\dfrac{7-6}{22}=\dfrac{1}{22}\)
d) \(\dfrac{5}{6}-\dfrac{5}{12}=\dfrac{10}{12}-\dfrac{5}{12}=\dfrac{10-5}{12}=\dfrac{5}{12}\)


1/2 + 3/6 + 5/10 + 7/14 + 9/18 + 11/22
= 1/2 + ( 3/6=1/2) + (5/10=1/2) + (7/14 = 1/2) +( 9/18 =1/2) + (11/22 = 1/2)
= 1/2 + 1/2 + 1/2 + 1/2 + 1/2 + 1/2
= 1 + 1 + 1
= 3

\(\frac{1}{2}+\frac{3}{6}+\frac{5}{10}+\frac{7}{14}+\frac{9}{18}+\frac{11}{22}=\frac{1}{2}+\frac{1}{2}+\frac{1}{2}+\frac{1}{2}+\frac{1}{2}+\frac{1}{2}=\frac{1}{2}.6=\frac{6}{2}=3\)
22+11+10+2+3+4=52
22 + 11 + 10 + 2 + 3 + 4=52