tinh bang cach thuan tien nhat: 20/11x33/23x69/180
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a)\(\frac{20}{11}.\frac{33}{23}.\frac{69}{180}=\frac{9}{9}=1\)
b: (675,98 + 888,66 + 111,34) x 0,01
= (675,98 + [888,66 + 111,34]) x 0,01
= (675,98 + 1000) x 0,01
= 1675,98 x 0,01
= 16,7598
(675,98 + 888,66 + 111,34) x 0,01
= (675,98 + [888,66 + 111,34]) x 0,01
= (675,98 + 1000) x 0,01
= 1675,98 x 0,01
= 16,7598
20, 11×96+20, 11:0, 25
= 20,11 x 96 + 20,11 x 4
= 20,11 x ( 96 + 4 )
= 20,11 x 100
= 2011
( 5 + 10 + 15 + 20 + 25 + 30 + 35 ) x ( 42 - 6 x 7 )
= ( 5 + 10 + 15 + 20 + 25 + 30 + 35 ) x ( 42 - 42 )
= ( 5 + 10 + 15 + 20 + 25 + 30 + 35 ) x 0
= 0
\(\dfrac{1}{3}+\dfrac{6}{5}-\dfrac{1}{5}+\dfrac{2}{3}=2\)
\(\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+\frac{1}{30}\)
\(=\frac{1}{2\times3}+\frac{1}{3\times4}+\frac{1}{4\times5}+\frac{1}{5\times6}\)
\(=\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}\)
\(=\frac{1}{2}+\left(\frac{1}{3}-\frac{1}{3}\right)+\left(\frac{1}{4}-\frac{1}{4}\right)+\left(\frac{1}{5}-\frac{1}{5}\right)-\frac{1}{6}\)
\(=\frac{1}{2}-\frac{1}{6}\)
\(=\frac{1}{3}\)
dinh hoang vu
\(\frac{1212}{1515}=\frac{1212\div101}{1515\div101}\)
\(=\frac{12}{15}=\frac{4}{5}\)
\(\frac{20}{11}\times\frac{33}{23}\times\frac{69}{180}\)
= \(\frac{20}{11}\times\frac{33}{23}\times\frac{69}{180}=\frac{20\times33\times69}{11\times23\times180}\)\(=\frac{1\times3\times3}{1\times1\times9}=\frac{9}{9}=1\)
k mk nha Nguyễn Lê Tiểu Long
20*33*69=20*11*3*23*3=3*3=9
11*23*180=11*23*20*9=9=9
=1