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\(\frac{19}{35}+\frac{15}{19}+\frac{16}{35}+\frac{23}{19}+\frac{4}{15}+\frac{11}{15}\)
\(=\left(\frac{19}{35}+\frac{16}{35}\right)+\left(\frac{15}{19}+\frac{23}{19}\right)+\left(\frac{4}{15}+\frac{11}{15}\right)\)
\(=\frac{35}{35}+\frac{38}{19}+\frac{15}{15}\)
\(=1+2+1\)
\(=4\)
\(\frac{19}{35}+\frac{15}{19}+\frac{16}{35}+\frac{23}{19}+\frac{4}{15}+\frac{11}{15}\)
\(=\left(\frac{19}{35}+\frac{16}{35}\right)+\left(\frac{15}{19}+\frac{23}{19}\right)+\left(\frac{4}{15}+\frac{11}{15}\right)\)
\(=1+2+1\)
\(=4\)
Học tốt
8/19 × 5/11 + 8/19 × 6/11 + 11/19
= 8/19 × (5/11 + 6/11) + 11/19
= 8/19 × 1 + 11/19
= 8/19 + 11/19
= 1
Ủng hộ mk nha ♡_♡
(2/143+2/195+2/255+2/323+2/399).462-y=19
=> 10/231.462-y=19
=> 20-y=19
=> y= 20-19=1
DUYỆT NHA "T I C K"
\(\frac{6}{11}.\frac{15}{19}+\frac{15}{19}:\frac{11}{16}=\frac{6}{11}.\frac{15}{19}+\frac{15}{19}.\frac{16}{11}=\frac{15}{19}.\left(\frac{6}{11}+\frac{16}{11}\right)=\frac{15}{19}.2=\frac{30}{19}\)
Ta co : \(\frac{6}{11}.\frac{15}{19}+\frac{15}{19}:\frac{11}{16}\)
\(=\frac{6}{11}.\frac{15}{19}+\frac{15}{19}.\frac{16}{11}\)
\(=\frac{5}{19}\left(\frac{6}{11}+\frac{16}{11}\right)\)
\(=\frac{5}{19}.\frac{22}{11}\)
\(=\frac{5}{19}.2\)
\(=\frac{10}{19}\)