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a) 7.3x8.3+3.8x7.3-5x7.3x0.4
=7.3x(8.3+3.8-5x0.4)
=7.3x10.1
=73.73
b)\(\frac{1}{10}:0.1-\frac{1}{8}:0.125+\frac{1}{2}:0.5-\frac{1}{4}:0.25\)
=1-1+1-1=0
c)\(\left(\frac{2727}{3636}+\frac{1212}{5454}\right)\times\left(\frac{9}{70}\right)=\left(\frac{3}{4}+\frac{2}{9}\right)\times\left(\frac{9}{70}\right)\)
=\(\frac{35}{36}\times\frac{9}{70}\)=\(\frac{1}{8}\)
d) 120x999+\(\frac{120}{5\times2.5\times125\times4\times0.8}\)
=120x999+\(\frac{120}{5000}\)
=120x999+\(\frac{3}{125}\)
=119880.024
\(2x-\frac{4.36}{0.125}=0.15\times42.9-11.7\times0,25\times0.8\)
\(2x-\frac{872}{25}=\frac{819}{200}\)
\(2x=\frac{819}{200}+\frac{872}{25}=\frac{1559}{40}\)
\(x=\frac{1559}{40}\times\frac{1}{2}=\frac{1559}{80}\)
A = \(\dfrac{1}{2}\): 5 + \(\dfrac{1}{4}\): 0,25 + \(\dfrac{1}{8}\): 0,125
A = \(\dfrac{1}{2}\) \(\times\) \(\dfrac{1}{5}\) + \(\dfrac{1}{4}\) \(\times\) 4 + \(\dfrac{1}{8}\) \(\times\) 8
A = \(\dfrac{1}{10}\) + 1 + 1
A = 0,1 + 2
A = 2,1
Câu 1.0,5+0,5=1
Câu 2.0,25+0,25=0,5
Câu 3.0,125+0,125=0,25
Câu 4.0,0625+0,0625=0,125
Câu 5.15,39+25,5=40,89
1)\(y\times7:5+4\times8=134\)
\(\Leftrightarrow y\times7:5+32=134\)
\(\Leftrightarrow y\times7:5=102\)
\(\Leftrightarrow y\times7=510\)
\(\Leftrightarrow y=72,86\)
2) \(\dfrac{1}{4}:0,25-\dfrac{1}{8}:0,125+\dfrac{1}{2}:0,5-\dfrac{1}{10}\)
\(=0,25:0,25-0,125:0,125+0,5:0,5-\dfrac{1}{10}\)
\(=1-1+1-\dfrac{1}{10}\)
\(=\dfrac{9}{10}\)
\(\frac{1}{2}x\frac{2}{5}x\frac{1}{5}x0,8x0,25x0,125\)
=\(\frac{1}{2}x\frac{2}{5}x\frac{1}{5}x\frac{4}{5}x\frac{1}{4}x\frac{1}{8}\)
=\(\frac{1x2x1x4x1x1}{2x5x5x5x4x8}\)
=\(\frac{1x1x1x1x1x1}{1x5x5x5x1x8}\)
=\(\frac{1}{1000}\)
\(\frac{1}{2}\times\frac{2}{5}\times\frac{1}{5}\times0,8\times0,25\times0,125\)
\(=0,5\times0,4\times0,2\times0,8\times0,25\times0,125\)
\(=\left(0,5\times0,2\right)\times\left(0,4\times0,25\right)\times\left(0,8\times0,125\right)\)
\(=0,1\times0,1\times0,1\)
\(=0,001\)