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\(x+\frac{15}{7}=\frac{9}{2}\)
\(x=\frac{9}{2}-\frac{15}{7}=\frac{33}{14}\)
\(x-\frac{3}{4}=\frac{7}{2}\)
\(x=\frac{7}{2}+\frac{3}{4}=\frac{17}{4}\)
\(x.\frac{7}{8}=\frac{12}{5}\)
\(x=\frac{12}{5}:\frac{7}{8}=\frac{96}{35}\)
\(\frac{5}{6}:x=\frac{4}{3}\)
\(x=\frac{5}{6}:\frac{4}{3}=\frac{5}{8}\)
- a) x=9/2-15/7=33/14
- b) x=7/2+3/4=17/4
- c) x=12/5:7/8=61/35
- d) x=5/6:4/3=5/8
- k nha
a.5/6 - 26/5 X 1/13 = 13/30
b.( 19/23 - 22/46 ) X 23/46 = 3/23
c.25/8 x 14/30 = 35/24
d.( 3/4 x 5/7 ) x ( 20/9 x 14/15 ) = 10/9
e.4/35 x 25/32 x 38/24 = 95/672
g. 1/2 x 3/4 x 2/3 x 4/5 = 1/5
h.5/6 x 11/4 - 5/4 x 23/6 = -5/2
i.9/16 x 13/4 - 9/4 x 5/16 + 9/16 x 17/4 = 225/64
k.( 7 x 1/3 ) x ( 1/7 x 6 ) = 2
m.2/3 x ( 3/5 + 3/7 ) = 34/35
n.4/5 x ( 5/8 + 7/4 ) = 19/10
p.( 1/33 + 31/333 - 341/3333 ) x ( 1/2 - 1/3 - 1/6 ) = 0
mih giành cả nửa tiếng để giải đó , k nha
a) \(\frac{3}{5}+\frac{6}{11}+\frac{7}{13}+\frac{5}{11}+\frac{2}{5}+\frac{19}{13}=\left(\frac{3}{5}+\frac{2}{5}\right)+\left(\frac{6}{11}+\frac{5}{11}\right)+\left(\frac{7}{13}+\frac{19}{13}\right)=1+1+2=4\)
b) \(\frac{6}{5}\times\frac{3}{8}+\frac{5}{8}\times\frac{6}{5}-\frac{4}{5}=\frac{6}{5}\times\left(\frac{3}{8}+\frac{5}{8}\right)-\frac{4}{5}=\frac{6}{5}-\frac{4}{5}=\frac{2}{5}\)
c) \(\frac{4\times5\times6\times7\times8}{8\times10\times12\times14\times16}=\frac{1}{2\times2\times2\times2\times2}=\frac{1}{32}\)
a, \(\frac{3}{5}+\frac{6}{11}+\frac{7}{13}+\frac{6}{11}+\frac{2}{5}+\frac{19}{13}\)
\(=\left(\frac{3}{5}+\frac{2}{5}\right)+\left(\frac{7}{13}+\frac{19}{13}\right)+\left(\frac{6}{11}+\frac{6}{11}\right)\)
\(=1+2+\frac{12}{11}\)
\(=3+\frac{12}{11}\)
\(=\frac{45}{11}\)
\(\frac{5}{1.6}\)+ \(\frac{5}{6.11}\)+ .........+\(\frac{5}{501.506}\)
=\(\frac{1}{1.6}+\frac{1}{6.11}+.....+\frac{1}{501.506}\)
=\(\frac{1}{1}-\frac{1}{6}+\frac{1}{6}-\frac{1}{11}+......+\frac{1}{501}-\frac{1}{506}\)
=\(\frac{1}{1}-\frac{1}{506}\)
= tự tính nha
Giải
Làm thử thoi nhoa !
a)8,3.39-2,93.500+19,8.20
=323,7-1465+396
=323,7+396-1465
=719,7-1456
=-745,3
c. 9,31 : 6 + 13,8 : 6 - 5,11 : 6
= (9,31 + 13,8 - 5,11) : 6
= 18 : 6
= 3
d. \(\frac{19,8\div0,2\times44,44\div0,5\times13,2\div0,25}{3,3\times88,88\div0,5\times6,6\div0,125\times5} \)
= \(\frac{3\div0,2\times1\div1\times4\div1}{1\times2\div1\times1\div2\times5}\)(Bước này rút gọn = cách gạch chéo nhưng mik ko gạch đc nên viết lun)
= \(\frac{60}{5}\)
= \(12\)
T làm 2 câu khó này thoyy :))
d, \(\frac{19,8\div0,2\times44,44\div0,5\times13,2\div0,25}{3,3\times88,88\div0,5\times6,6\div0,125\times5}\)
\(=\frac{3,3\times6\times5\times44,44\times2\times6,6\times2\times4}{3,3\times44,44\times2\times2\times6,6\times8\times5}=\frac{6.4}{8}=\frac{24}{8}=3\)
f, \(\frac{\frac{4}{7}+\frac{12}{13}+\frac{16}{17}-\frac{8}{27}}{\frac{5}{21}+\frac{15}{39}+\frac{20}{51}-\frac{10}{81}}\)
\(=\frac{4\left(\frac{1}{7}+\frac{3}{13}+\frac{4}{17}-\frac{2}{27}\right)}{\frac{5}{7}\times\frac{1}{3}+\frac{15}{13}\times\frac{1}{3}+\frac{20}{17}\times\frac{1}{3}+\frac{10}{27}\times\frac{1}{3}}\)
\(=\frac{4\left(\frac{1}{7}+\frac{3}{13}+\frac{4}{17}-\frac{2}{27}\right)}{\frac{1}{3}\left(\frac{5}{7}+\frac{15}{13}+\frac{20}{17}+\frac{10}{27}\right)}=\frac{4\left(\frac{1}{7}+\frac{3}{13}+\frac{4}{17}-\frac{2}{27}\right)}{\frac{5}{3}\left(\frac{1}{7}+\frac{3}{13}+\frac{4}{17}-\frac{2}{27}\right)}=\frac{4}{\frac{5}{3}}=4\times\frac{3}{5}=\frac{12}{5}\)
e) Cho \(A=\frac{5}{1.6}+\frac{5}{6.11}+...+\frac{5}{501.506}\)
\(\Rightarrow A=\frac{1}{1}-\frac{1}{6}+\frac{1}{6}-\frac{1}{11}+...+\frac{1}{501}-\frac{1}{506}\)
\(\Rightarrow A=1-\frac{1}{506}\)
\(\Rightarrow A=\frac{505}{506}\)
^-^