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\(\frac{88}{y:8+13}\)=\(\frac{88}{y:8}+\frac{88}{13}\)=
vô lý
ko có điều kiện của y
= \(\frac{145,7-58+0,3}{X:8+13}=4\)
=\(\frac{87,7+0,3}{X:8+13}=4\)
= \(\frac{90}{X:8+13}=4\)
X : 8 + 13 = 90 : 4
X : 8 + 13 = 22,5
X : 8 = 22,5 - 13
X : 8 = 9,5
X = 9,5 x 8
X = 76
\(\frac{145,7-290\div5+0,3}{x\div8+13}=4\)
\(\frac{88}{x\div8+13}=4\)
\(x\div8+13=88\div4\)
\(x\div8+13=22\)
\(x\div8=22-13\)
\(x\div8=9\)
\(x=9\times8\)
\(x=72\)
145,7 - 280: 5 + 0,3:y:8 + 13 = 4
145,7 - 56 + 0,3:y:8 + 13 = 4
(145,7 - 56 + 13) + 0,3:y:8 = 4
102,7 + 0,3:y:8 = 4
0,3:y:8 = 4 - 102,7
0,3:y: 8 = - 98,7
0,3: y = - 98,7 x 8
0,3 : y =- 789,6
y = 0,3 : (-789,6)
y = - \(\dfrac{1}{2632}\)
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, \(\frac{3}{5}+\frac{6}{11}+\frac{7}{13}+\frac{6}{11}+\frac{2}{5}+\frac{19}{13}\)
\(=\left(\frac{3}{5}+\frac{2}{5}\right)+\left(\frac{7}{13}+\frac{19}{13}\right)+\left(\frac{6}{11}+\frac{6}{11}\right)\)
\(=1+2+\frac{12}{11}\)
\(=3+\frac{12}{11}\)
\(=\frac{45}{11}\)
4/5 x 0,5 + 12/5 x 0,3 + 8 : 10 x 0,2
=4/5 x 0,5 + 12/5 x 0,3 + 4/5 x 0,2
=(4/5 + 12/5 + 4/5) x (0,5 + 0.3 + 0,2)
=4 x 1
=4
\(\frac{4}{5}x0,5+\frac{12}{5}x0,3+8:10x0,2=\)\(\frac{4}{5}x0,5+\frac{12}{5}x0,3+\frac{8}{10}x0,2=\)\(\frac{4}{5}x0,5+\frac{12}{5}x0,3+\frac{4}{5}x0,2=\)
\(=\frac{4}{5}x\left(0,5+0,2\right)+\frac{12}{5}x0,3\)\(=\frac{4}{5}x\frac{7}{10}+\frac{12}{5}x0,3=\frac{32}{25}\)
\(\frac{145,7-290:5+0,3}{x:8+13}=4\)
=> \(\frac{145,7-58+0,3}{x:8+13}=4\)
=> \(\frac{88}{x:8+13}=4\)
=> \(x:8+13=88:4\)
=> \(x:8+13=22\)
=> x : 8 = 9
=> x = 9 x 8 = 72
Vậy x = 72
\(x = {-b \pm \s\)