\(=15.\left(\frac{21.10101}{43.10101}+\frac{33.10101}{35.10101}\right)\)

\(=15.\left(\frac{21}{43}+\frac{33}{35}\right)\)

\(=15.\frac{2154}{1505}\)

\(=\frac{6462}{301}\)

15 x (\(\frac{212121}{434343}+\frac{333333}{3535335}\)) = 15 x ( \(\frac{21.10101}{43.10101}+\frac{33.10101}{35.10101}\))

= 15 x ( \(\frac{21}{43}+\frac{33}{35}\)) = 5 x 3 x \(\frac{735}{1505}+\frac{1419}{1505}\)= 5 x 3 x \(\frac{2154}{1505}\)= \(\frac{6462}{301}\)

=15(21/43+33/35)

=6462/301

a)=15.2154/1505

=6462/301

b)=461179719/138076

c,=134724+400/135136-12

=135124/135124

=1

\(a)15.\left(\dfrac{212121}{434343}+\dfrac{333333}{353535}\right)\)

\(=15.\left(\dfrac{21}{43}+\dfrac{33}{35}\right)\)

\(=15.\dfrac{2154}{1505}\)

\(=\dfrac{6462}{301}\)

=15x(21/43+33/35)

=tự tính

nhưng tính nhanh mà cậu

\(=15.\left(\frac{21.10101}{43.10101}-\frac{33.10101}{35.10101}\right)\)

\(=15.\left(\frac{21}{43}-\frac{33}{35}\right)\)

\(=15.\frac{-684}{1505}=\frac{-2052}{301}\)

ki hieu . la nhan do nha ban len cap 2 se thay dau x = .

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