a) 3 x X x 2/3 = 4/5
3.x=6/5
x=2/5
b) 3,94 x 18,24 + 18,24 x 3,72 + 18,24 x 2,34
=18,24(3,94+3,72+2,34)
=18,24.10
=182,4
d) 8/19 x 2/7 + 8/19 x 1/7 + 8/19 x 4/7
=8/19(2/7+1/7+4/7)
=8/19.1
=8/19
a)\(3xXx\frac{2}{3}=\frac{4}{5}\) b)\(3,94x18,24+18,24x3,72+18,24x2,34\)
\(3xX=\frac{4}{5}:\frac{2}{3}\) \(=18,24x\left(3,94+3,72+2,34\right)\)
\(3xX=\frac{6}{5}\) \(=18,24x10\)
\(X=\frac{6}{5}:3\) \(=182,4\)
\(X=\frac{2}{5}\)
Toàn nói bậy vậy lam 2212 .
c) 8/9 + 14/27 + 1/9 + 13/27
=(8/9+1/9)+(14/27+13/27)
=1+1
=2
c) \(\frac{8}{9}+\frac{14}{27}+\frac{1}{9}+\frac{13}{27}\) d)\(\frac{8}{19}x\frac{2}{7}+\frac{8}{19}x\frac{1}{7}+\frac{8}{19}x\frac{4}{7}\)
\(=\left(\frac{8}{9}+\frac{1}{9}\right)+\left(\frac{14}{27}+\frac{13}{27}\right)\) \(=\frac{8}{19}x\left(\frac{2}{7}+\frac{1}{7}+\frac{4}{7}\right)\)
\(=1+1\) \(=\frac{8}{19}x1\)
\(=2\) \(=\frac{8}{19}\)
