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0,(7)=7/9
0,(18)=2/11
2,(125)=2123/999
0,0(6)=1/15
1,1(2)=101/90
0,(7)=0,(1).7=\(\dfrac{1}{9}\).7=\(\dfrac{7}{9}\)
0,(18)=0,(01).18=\(\dfrac{1}{99}.18=\dfrac{18}{99}\)
2,(125)=2+0,(001).125=\(2+\dfrac{1}{999}.125\)=2+\(\dfrac{125}{999}\)=\(\dfrac{2123}{999}\)
0,0(6)=0,(6):10=0,(1):10.6=\(\dfrac{1}{9}:10.6=\dfrac{1}{15}\)
1,1(2)=1+0,1(2)=1+0,(2):10+\(\dfrac{1}{10}\)=1+0,(1):10.2+\(\dfrac{1}{10}=1+\dfrac{1}{9}:10.2+\dfrac{1}{10}=\dfrac{101}{99}\)
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\(1,1\left(234\right)=\dfrac{1247}{1110}\\ -2,23\left(123\right)=-\dfrac{743}{333}\)
\(2,\left(18\right)=2+0,\left(18\right)=2+\frac{18}{99}\)=24/11
Đây bạn nhé
\(\text{Trả lời :}\)
\(2,(18) = 2,1818181818....... = \frac{10909090909......}{5000000000......}\)
\(\text{#Hok tốt!}\)
0,7=\(\frac{7}{10}\)
0,621=\(\frac{621}{100}\)
0,(7)=\(\frac{7}{9}\);0,(18)=\(\frac{2}{11}\);2,(125)=\(\frac{2123}{999}\);0.0(6)=\(\frac{1}{15}\);1,1(2)=\(\frac{101}{90}\)
0,(7)=0,(1)x7=1/9x9=7/9
0,(18)=0,(01)x18=1/99x18=2/11
2,(125)=2+0,(001)x125=2+125x1/999=2 và 125/999
0,0(6)=[0,(1)x6]/10=[1/9x6]/10=2/3:10=20/3
1,1(2)=[(11+0,(1)x2]:10=[11+1/9x2]:10=[11+2/9]:10=101/9:10=1010/9