A=7/19.8/11+7/19.3/11+12/19
A=7/19.(8/11+3/11)+12/19
A=7/19.1+12/19
A=7/19+12/19
A=1
Ai có lòng tốt
cho mình một
tích đúng nhé.
Bài làm
\(A=\frac{7}{19}.\frac{8}{11}+\frac{7}{19}.\frac{3}{11}+\frac{12}{19}\)
\(A=\frac{7}{19}.\left(\frac{8}{11}+\frac{3}{11}\right)+\frac{12}{19}\)
\(A=\frac{7}{19}.1+\frac{12}{19}\)
\(A=\frac{7}{19}+\frac{12}{19}\)
\(A=1\)
Bài làm
\(A=\frac{7}{19}.\frac{8}{11}+\frac{7}{19}.\frac{3}{11}+\frac{12}{19}\)
\(A=\frac{7}{19}.\frac{8}{11}+\frac{7}{19}.\frac{3}{11}+\frac{7}{19}.\frac{12}{7}\)
\(A=\frac{7}{19}.\left(\frac{8}{11}+\frac{3}{11}+\frac{12}{7}\right)\)
\(A=\frac{7}{19}\left(\frac{11}{11}+\frac{12}{7}\right)\)
\(A=\frac{7}{19}\left(1+\frac{12}{7}\right)\)
\(A=\frac{7}{19}\left(\frac{7}{7}+\frac{12}{7}\right)\)
\(A=\frac{7}{19}.\frac{19}{7}\)
\(A=1\)
Vậy A = 1
