Tính giá trị biểu thức : ( 20,13 - 20,13 : 11 + 1/4 ) : 1/4
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25 x 20,13 + 4 x 20,13 - 2013 x 20,33 + 2013 x 20,04
= 20,13 x ( 25+4) - 2013 x ( 20,33 - 20,04)
= 20,13 x 29 - 2013 x 0,29
= 20,13 x 100 x 0,29 - 2013 x 0,29
= 2013 x 0,29 - 2013 x 0,29
= 0
a. 20,13 x 84,5 x 20,13
= 20,13 x 84,5 x 20,13 x 1
= 20,13 x ( 84,5 + 1 )
= 20,13 x 85,55
b. 4,5 x 11/5 + 5,5 x 11/5
= ( 4,5 + 5,5 ) x 11/5
= 10 x 11/5
= 22
a]20,13 * 84,5 * 20,13 = 20,13 * 2 * 84,5
= 20,13 * 169
= 3401,97
b] 4,5 * 11/5 + 5,5 * 11/5 = 11/5 * [4,5 + 5,5]
= 2,2 * 10
= 22
20,13 x104 - 20,13 :0,25
= 20,13 x 104 - 20,13 x 4
= 20,13 x ( 104 - 4 )
= 20,13 x 100
= 2013
_HT_
\(20,13\cdot104-20,13:0,25\)
\(=20,13\cdot104-20,13\cdot4\)
\(=20,13\left(104-4\right)\)
\(=20,13\cdot100=2013\)
\(\dfrac{11}{2}\): \(\dfrac{1}{4}\) \(\times\) \(\dfrac{5}{3}\)
= \(\dfrac{11}{2}\) \(\times\) \(\dfrac{4}{1}\) \(\times\) \(\dfrac{5}{3}\)
= 22 \(\times\) \(\dfrac{5}{3}\)
= \(\dfrac{110}{3}\)
\(\dfrac{5}{2}-\dfrac{1}{4}+\dfrac{5}{3}\)
= \(\dfrac{30}{12}-\dfrac{3}{12}+\dfrac{20}{12}\)
= \(\dfrac{7}{12}\)
\(\dfrac{14}{5}\times\dfrac{2}{3}\)+ 5
= \(\dfrac{28}{15}\) + 5
= \(\dfrac{28}{15}\) + \(\dfrac{75}{15}\)
= \(\dfrac{103}{15}\)
\(\left(20,13-20,13:11+\dfrac{1}{4}\right):\dfrac{1}{4}\\ =\left(20,13-1,83+\dfrac{1}{4}\right):\dfrac{1}{4}\\ =\left(18,3+0,25\right):0,25\\ =18,55:0,25\\ =74,2\)
(20,13−20,13:11+14):14=(20,13−1,83+14):14=(18,3+0,25):0,25=18,55:0,25=74,2