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A,
20,19 x 111- 20,19:0,1- 2019
= 20,19x ( 111+ 10 - 1 )
=20,19 x 120
=2422,8
B,
1/100 -1/2 : 50% + 1/4 : 25% - 1/8 : 0,125 + 1999 : 1999
= 0,01 - 0,5 : 0,5 + 0,25 : 0,25 - 0,125 : 0,125 + 1
= 0,01 - 1 + 1 - 1 +1
= 0,01+ ( 1+1 - 1- 1 )
=0,01
em ơi cái này = 0 . Anh chắc chắn vs em 100000000000000000000000000000000000000000000000000000000000000000%
Anh lớp 7 mà
a) \(\frac{1}{4}:0,25-\frac{1}{8}:0,125+\frac{1}{2}:0,5+\frac{1}{10}\)
\(=0,25:0,25-0,125:0,125+0,5:0,5+0,1\)
\(=1-1+1+0,1\)
\(=1,1\)
\(\frac{1}{8}\times58,35+0,125\times41+12,5\%\times0,65\)
\(=0,125\times58,35+0,125\times41+0,125\times0,65\)
\(=0,125\times\left(58,35+41+0,65\right)\)
\(=0,125\times100\)
\(=12,5\)
\(\frac{1}{8}\)x 58,35 + 0,125 x 41 + 12,5% x 0,65
= \(\frac{1}{8}\)x 58,35 + \(\frac{1}{8}\)x 41 + \(\frac{1}{8}\)x 0,65
= \(\frac{1}{8}\)x ( 58,35 + 41 + 0,65 )
= \(\frac{1}{8}\)x 100
= 12,5
\(\dfrac{1}{4}:0,25-\dfrac{1}{8}:0,125+\dfrac{1}{2}:0,5-\dfrac{1}{16}:0,0625\\ =0,25:0,25-0,125:0,125+0,5:0,5-0,0625:0,0625\\ =1-1+1-1\\ =0+1-1\\ =1-1\\ =0\)
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\(\frac{1}{2}\)x \(\frac{9}{10}\)+ \(\frac{8}{10}\)+ \(\frac{2}{4}\)+ \(\frac{3}{10}\)x \(0,5\)
= \(0,5\)x \(0,9\)+ \(0,8\)+ \(0,5\)x \(0,5\)
\(=0,45\)x \(1,3\)x \(0,5\)
\(=0,45\)x \(0,65=0,2925\)
\(\dfrac{1}{10}+\dfrac{2}{10}+\dfrac{3}{10}+\dfrac{4}{10}+\dfrac{5}{10}+\dfrac{6}{10}+\dfrac{7}{10}+\dfrac{8}{10}+\dfrac{9}{10}\)
\(=\left(\dfrac{1}{10}+\dfrac{9}{10}\right)+\left(\dfrac{2}{10}+\dfrac{8}{10}\right)+\left(\dfrac{3}{10}+\dfrac{7}{10}\right)+\left(\dfrac{4}{10}+\dfrac{6}{10}\right)+\dfrac{5}{10}\)
\(=1+1+1+1+\dfrac{5}{10}\)
\(=4+\dfrac{5}{10}\)
\(=\dfrac{45}{10}\)
\(13,25:0,5+13,25:0,25+13,25:0,125+13,25\times6\)
\(=13,25:\dfrac{1}{2}+13,25:\dfrac{1}{4}+13,25:\dfrac{1}{8}+13,25\times6\)
\(=13,25\times2+13,25\times4+13,25\times8+13,25\times6\)
\(=13,25\times\left(2+4+8+6\right)\)
\(=13,25\times20\)
\(=265\)
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