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Bài 1: viết các số thập phân hữu hạn sau đây dưới dạng phân số tối giản:
0,32 ; -0,124 ; 1,28 ; -3,12
\(0,32=\dfrac{32}{100}=\dfrac{8}{25}\\ -0,124=\dfrac{-124}{1000}=\dfrac{-31}{250}\\ 1,28=\dfrac{128}{100}=\dfrac{32}{25}\\ -3,12=\dfrac{-312}{100}=\dfrac{-78}{25}\)
\(0,32=\dfrac{8}{25}\)
\(-0,124=\dfrac{-31}{250}\)
\(1,28=\dfrac{32}{25}\)
\(-3,12=\dfrac{-78}{25}\)
Chúc bn học tốt!!
a)0,32=32/100=8/25
b)-0,124=-124/1000=-31/250
c)1,28=128/100=32/25
d)-3,12=-312/100=-78/25
a) 0,32 = 8/25.
b) -0,124 = -31/250.
c) 1,28 = 32/25.
d) -3,12 = -78/25.
\(0,32=\frac{32}{100}=\frac{8}{25}\)
\(-0,124=\frac{-124}{1000}=\frac{-31}{250}\)
\(1,28=\frac{128}{100}=\frac{32}{25}\)
\(-3,12=\frac{-312}{100}=\frac{-78}{25}\)
a) 0,32=32100=324:1004=8250,32=32100=324:1004=825
b) −0,124=−1241000=−1244:10004=−31250−0,124=−1241000=−1244:10004=−31250
c) 1,28=128100=32251,28=128100=3225
d) −3,12=−312100=−3124:1004=−7825−3,12=−312100=−3124:1004=−7825
a) 0,32=32100=8.425.4=8250,32=32100=8.425.4=825
b) –0,124=–1241000=–31.4250.4=–31250–0,124=–1241000=–31.4250.4=–31250
c) 1,28=128100=32.425.4=32251,28=128100=32.425.4=3225
d) –3,12=–312100=–78.425.4=–7825
a) 0 , 32=8/25
b) -0,124=-31/250
c) 1,28=32/25
d) -3,12=-78/25
a) \(0,32=\frac{32}{100}=\frac{8}{25}\)
b) \(-0,124=-\frac{124}{1000}=-\frac{31}{250}\)
c) \(1,28=\frac{128}{100}=\frac{32}{25}\)
d) \(-3,12=-\frac{312}{100}=-\frac{78}{25}\)
1,
a , 8,5 : 3 = 2.8333...
Chu kì là 3
b,18,7 : 6 = 3,116666...
Chu kì là 6
c, 58 : 11 = 5,272727...
Chu kì là 27
d, 14,2 : 3,33 = 4,264264...
Chu kì là 264
2,
a , 0,32 = \(\frac{8}{25}\)
b, -0, 124 = \(\frac{-31}{250}\)
c, 1,28 = \(\frac{32}{25}\)
d. -3,12 = \(\frac{-78}{25}\)
3,
\(\frac{1}{99}\) =0,(01)
\(\frac{1}{999}\) = 1.(001)
a) 0,32 = \(\frac{32}{100}=\frac{2^5}{10^2}=\frac{2^5}{\left(2.5\right)^2}=\frac{2^3}{5^2}=\frac{8}{25}\)
b) -0,124 = \(\frac{124}{1000}=\frac{-31.4}{10^3}=\frac{-31.2^2}{2^3.5^3}=\frac{-31}{2.5^3}=\frac{-31}{250}\)
c) 1,28 = \(\frac{32}{25}\)
d) -3,12 = \(\frac{-78}{25}\)
ok mk nhé!! 4354655756768679235255435464566757687698989783635456546575675675676876876
a) \(0,32=\) \(\frac{32}{10}=\frac{16}{5}\)
b) \(-0,124=-\frac{124}{1000}=-\frac{31}{250}\)
c) \(1,28=\frac{128}{100}=\frac{32}{25}\)
d) \(-3,12=-\frac{312}{100}=-\frac{78}{25}\)
nha bn
\(0,32=\frac{8}{25}\)
\(-0,124=-\frac{31}{250}\)
\(1,28=\frac{32}{25}\)
\(-3,12=-\frac{78}{25}\)
\(0,32=\frac{32}{100}=\frac{4.8}{4.25}=\frac{8}{25}\)
\(-0,124=\frac{-124}{1000}=\frac{-4.31}{4.25}=\frac{-31}{250}\)
\(1,28=\frac{128}{100}=\frac{4.32}{4.25}=\frac{32}{25}\)
\(-3,12=\frac{-312}{100}=\frac{-4.78}{4.25}=\frac{-78}{25}\)