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\(a.\)
\(0.3=\dfrac{3}{10}\)
\(0.72=\dfrac{72}{100}\)
\(1.5=\dfrac{15}{10}\)
\(9.347=\dfrac{9347}{1000}\)
\(b.\)
\(\dfrac{1}{2}=\dfrac{5}{10}\)
\(\dfrac{2}{5}=\dfrac{4}{10}\)
\(\dfrac{3}{4}=\dfrac{75}{100}\)
\(\dfrac{6}{25}=\dfrac{24}{100}\)
a) \(0,3=\dfrac{3}{10}\)
\(0,72=\dfrac{72}{100}\)
\(1,5=\dfrac{15}{10}\)
\(9,347=\dfrac{9347}{1000}\)
b) \(\dfrac{1}{2}=\dfrac{5}{10}\)
\(\dfrac{2}{5}=\dfrac{4}{10}\)
\(\dfrac{3}{4}=\dfrac{75}{100}\)
\(\dfrac{6}{25}=\dfrac{24}{100}\)
`a,3/10=0,3`
`3/100=0,03`
`4 25/100=4 1/4=4,25`
`2002/1000=2,002`
`b,1/4=0,25`
`3/5=0,6`
`7/8=0,875`
`1 1/2=1,5`
\(\dfrac{4}{5}+x=3\dfrac{1}{5}\)
\(\Leftrightarrow\dfrac{4}{5}+x=\dfrac{16}{5}\)
\(\Leftrightarrow0,8+x=3,2\)
\(\Leftrightarrow x=3,2-0,8\)
\(\Leftrightarrow x=2,4\)
\(\dfrac{4}{5}+x=3\dfrac{1}{5}\)
⇔ \(\dfrac{4}{5}+x=\dfrac{16}{5}\)
⇔ \(x=\dfrac{12}{5}=2,4\)
\(\dfrac{1}{10}=0.1\)
\(\dfrac{1}{100}=0.01\)
\(\dfrac{1}{1000}=0.001\)
\(\dfrac{1}{10000}=0.0001\)
câu 1 A
câu 2
4/5dm3=75000cm3
5 tấn 2kg=5.002
câu 3 B
câu 4 1.5*(2+3.5)=8.25cm3
b) chọn B
câu 5
7.8*0.35+0.35*2.1+0.35*0.1
=0.35*(7.8+2.1+0.1)
=0.35*10
=3.5
\(\dfrac{3}{2}=1,5\)
\(\dfrac{1}{2}=0,5\)
\(\dfrac{5}{4}=1,25\)
\(\dfrac{3}{2}\)=1,5
\(\dfrac{1}{2}\)=0,5
\(\dfrac{5}{4}\)=1,25