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x-2\(\frac{1}{4}\)=3\(\frac{1}{2}\)
x-\(\frac{9}{4}\)=\(\frac{7}{2}\)
x = \(\frac{7}{2}\)+\(\frac{9}{4}\)
x = \(\frac{23}{4}\)
các câu còn lại, bạn tự làm nhé
X - 2 1/4 = 3 1/2 X + 2 3/4 = 5 2/3 3 1/2 : X = 1 3/5 X : 1 1/2 = 2 2/5
X - 9/4 = 7/2 X + 11/4 = 17/3 7/2 : X = 8/5 X : 3/2 = 12/5
X = 7/2 + 9/4 X = 17/3 - 11/4 X = 7/2 : 8/5 X = 12/5 x 3/2
X = 13/4 X = 35/12 X = 35/16 X = 18/5
Nhớ tíck cho mik nha
Sai chỗ nào thì bảo mik
\(a,\left(x+\frac{5}{3}\right)\times\frac{9}{13}=\frac{2}{3}\\ \Rightarrow x+\frac{5}{3}=\frac{26}{27}\\ \Rightarrow x=-\frac{19}{27}\)\(b,43770\div x=560-434\\ \Rightarrow43770\div x=126\\ \Rightarrow x=\frac{7295}{21}\)\(c,x\div3\frac{1}{3}=2\frac{2}{5}+\frac{7}{10}\\ x\div3\frac{1}{3}=\frac{31}{10}\\ x=\frac{31}{3}\)
Ta có: \(1\frac{4}{5}+2\frac{5}{7}+3\frac{4}{5}+4\frac{5}{7}\)
\(=\left(1\frac{4}{5}+3\frac{4}{5}\right)+\left(2\frac{5}{7}+4\frac{5}{7}\right)\)
\(=\left(\frac{9}{5}+\frac{19}{5}\right)+\left(\frac{19}{7}+\frac{33}{7}\right)\)
\(=\frac{28}{5}+\frac{52}{7}=13\frac{1}{35}\)
= ( \(1\frac{4}{5}\)+ \(3\frac{4}{5}\)) + ( \(2\frac{5}{7}\)+ \(4\frac{5}{7}\))
= \(4\frac{4}{5}\) + \(6\frac{5}{7}\)
= \(\frac{24}{5}\) + \(\frac{47}{7}\)
= ...... ( tính nốt nhé )
\(8\frac{1}{6}:2\frac{1}{2}=\frac{49}{6}:\frac{5}{2}=\frac{98}{30}=\frac{49}{15}\)
\(1\frac{3}{10}:5\frac{7}{8}=\frac{13}{10}:\frac{47}{8}=\frac{104}{470}=\frac{52}{235}\)
Bn như thần ý nhỉ :)
trả lời:
8x1/6:2x1/2
=4/3:1
=4/3
1x3/10:5x7/8
=3/10:35/8
=12/175
chúc học tốt
1/3xD=1/(2x4)+1/(4x6)+...+1/(98x100)
2/3xD=2/(2x4)+2/(4x6)+...+1/(98x100)
2/3xD= 1/2-1/4+1/4-1/6+...+1/98-1/100
2/3xD=1/2-1/100
2/3xD=49/100
D=147/200
\(\frac{3}{2}+\frac{3}{8}+\frac{3}{32}+\frac{3}{128}+\frac{3}{512}\)
=\(\frac{3}{1.2}+\frac{3}{2.4}+\frac{3}{4.8}+\frac{3}{8.16}+\frac{3}{16.32}\)
=\(\frac{3}{1}-\frac{3}{2}+\frac{3}{2}-\frac{3}{4}+\frac{3}{4}-\frac{3}{8}+\frac{3}{8}-\frac{3}{16}+\frac{3}{16}-\frac{3}{36}\)
=\(\frac{3}{1}-\frac{3}{36}\)=\(\frac{35}{12}\)
a) \(\frac{3}{5}\times\frac{8}{27}\times\frac{5}{3}\)
\(=\left(\frac{3}{5}\times\frac{5}{3}\right)\times\frac{8}{27}\)
\(=1\times\frac{8}{27}\)
\(=\frac{8}{27}\)
b) \(\frac{7}{19}\times\frac{1}{3}+\frac{7}{19}\times\frac{2}{3}\)
\(=\frac{7}{19}\times\left(\frac{1}{3}+\frac{2}{3}\right)\)
\(=\frac{7}{19}\times1\)
\(=\frac{7}{19}\)
26/27-5/3=-19/27
43770:126=347(dư 48)
=31/10 :10/3=93/100
Hok tốt nha ban!!!
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