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1. \(\frac{12}{18}\)= \(\frac{2}{3}\)
\(\frac{22}{33}\)= \(\frac{2}{3}\)
\(\frac{1010}{1313}\)= \(\frac{10}{13}\)
\(\frac{27}{36}\)= \(\frac{3}{4}\)
\(\frac{202}{303}\)= \(\frac{2}{3}\)
\(\frac{1111}{1212}\)= \(\frac{11}{12}\)
2. a) 12 x \(\frac{1313}{13}\)x 1212
= 12 x \(\frac{13}{13}\)x 1212
1. \(\frac{12}{18}=\frac{2}{3}\): \(\frac{22}{33}=\frac{2}{3}\); \(\frac{1010}{1313}=\frac{10}{13}\); \(\frac{27}{36}=\frac{3}{4}\) ; \(\frac{202}{303}=\frac{2}{3}\);\(\frac{1111}{1212}=\frac{11}{12}\)
2 a)\(\frac{12X1313}{13X1212}=\frac{12X13X101}{13X12X101}=1\);b) \(\frac{1111X121212}{1212X111111}=\frac{11X101X12X10101}{12X101X11X10101}=1\)
\(\frac{12x101x13x10101}{13x101x12x10101}=\frac{12x10101x13x101}{12x10101x13x101}=\frac{121212x1313}{121212x1313}=1.\)
\(\frac{5}{11}.\frac{7}{25}+\frac{15}{11}.\frac{1}{5}\)
\(=\frac{5}{11}.\frac{7}{25}+\frac{5}{11}.3.\frac{1}{5}\)
\(=\frac{5}{11}.\frac{7}{25}+\frac{5}{11}.\frac{3}{5}\)
\(=\frac{5}{11}\left(\frac{7}{25}+\frac{3}{5}\right)\)
\(=\frac{5}{11}\left(\frac{7}{25}+\frac{15}{25}\right)\)
\(=\frac{5}{11}.\frac{22}{25}=\frac{2}{5}\)
42 x 2 x 7 x 5 =
= ( 42 x 7 ) x ( 2 x 5 )
= 294 x 10
= 2 940
$#Shả$
`A)=5/17xx(15/34+19/34)`
`=5/17xx1=5/17`
`B)=(13/12+7/12)+1/3`
`=5/3+1/3=2`
705 x 82 + 705 x 19 - 705 x 1
= 705 x ( 82 + 19 - 1 )
= 705 x 100
= 70500
3/5 x 5 + 12 x 3/5 + 3 : 5/3
=3/5 x 5 + 12 x 3/5 + 3 x 3/5
= 3/5 x ( 5 + 12 + 3 )
= 3/5 x 20
= 12
Bài này dễ thôi tham khảo nhé :)
Câu hỏi của ๖Eric Gaming - Toán lớp 4 - Học toán với OnlineMath
a) \(\frac{12.1313}{15.1212}=\frac{12.13.101}{15.12.101}=\frac{13}{15}\)
b) \(\frac{1111.121212}{1212.111111}=\frac{11.101.12.10101}{12.101.11.10101}=1\)