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a = 1/2 - 1/3 + 2/5 : 1/2
= 1/6 + 4/5
= 29/30
b X x 3/10 + X x 1/4 + 89 = 100
X x ( 3/10 + 1/4 ) + 89 = 100
X x 11/20 + 89 = 100
X x 11/20 = 100 - 89
X x 11/20 = 11
X = 11 : 11/20
X = 20
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\(\left(\frac{1}{1\cdot2}+\frac{1}{2\cdot3}+\frac{1}{3\cdot4}+...+\frac{1}{9\cdot10}\right)\cdot100-\left[\frac{5}{2}:\left(x+\frac{206}{100}\right)\right]:\frac{1}{2}=89\)
\(\left(1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{9}-\frac{1}{10}\right)\cdot100-\left[\frac{5}{2}:\left(x+\frac{103}{50}\right)\right]\cdot2=89\)
\(\left(1-\frac{1}{10}\right)\cdot100-\frac{5}{2}:\left(x+\frac{103}{50}\right)\cdot2=89\)
\(\frac{9}{10}\cdot100-\frac{5}{2}\cdot2:\left(x+\frac{103}{50}\right)=89\)
\(90-5\cdot\left(x+\frac{103}{50}\right)=89\)
\(5\cdot\left(x+\frac{103}{50}\right)=1\)
\(x+\frac{103}{50}=\frac{1}{5}\)
\(x=-\frac{93}{50}\)
x.3/10+x.1/4+89=100
x.(3/10+1/4)+89=100
x.11/20+89=100
x.11/20=100-89
x.11/20=11
x=11:11/20
x=20
X x 3/10 + X x 1/4 + 89 = 100
X x ( 3/10 + 1/4 ) + 89 = 100
X x 11/20 + 89 = 100
X x 11/20 = 100 - 89
X x 11/20 = 11
X = 11 : 11/20
X = 20