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a. ….= 61 692 : 4 = 15 423
….= 33 164 : 4 + 28 528 : 4
….= 8291 + 7132 = 15 423
b. ….= 387 079 : 7 = 55 297
….= 403 494 : 7 – 16 414 : 7
….= 57 642 - 2345 = 55 297
C1: 3/7×16/33+16/33×4/7
= 16/33×(3/7+4/7)
= 16/33×7/7
= 16/33×1=16/33
C2: 3/7×16/33+16/33×4/7
= 16/7×3/33+4/33×16/7
= 16/7×(3/33+4/33)
= 16/7×7/33
= 16/33
T i c k cho "chị" nha em! ^o^
a,\(\frac{7}{5}>\frac{5}{7}\)
b,\(\frac{14}{16}=\frac{24}{21}\)
a)
\(\frac{7}{5}>1\) ; \(\frac{5}{7}< 1\)
Nên \(\frac{7}{5}>\frac{5}{7}\)
b)
\(\frac{14}{16}< 1\) ; \(\frac{24}{21}>1\)
Nên \(\frac{14}{16}< \frac{24}{21}\)
\(\frac{16}{3}:\frac{8}{3}=\frac{16}{3}\times\frac{3}{8}=\frac{16}{8}=2\)
\(\frac{63}{35}:\frac{21}{5}=\frac{63}{35}.\frac{5}{21}=\frac{3}{7}.\frac{1}{1}=\frac{3}{7}\)
\(\frac{8}{14}\times\frac{7}{8}=\frac{7}{14}=\frac{1}{2}\)
\(\frac{19}{14}\times\frac{7}{15}=\frac{19}{2}\times\frac{1}{15}=\frac{19}{30}\)
\(a,\frac{16}{3}:\frac{8}{3}=\frac{16}{3}\times\frac{3}{8}=\frac{8\times2\times3}{3\times8}=2\)
\(b,\frac{63}{35}:\frac{21}{5}=\frac{63}{35}\times\frac{5}{21}=\frac{21\times3\times5}{5\times7\times21}=\frac{3}{7}\)
\(c,\frac{8}{14}\times\frac{7}{8}=\frac{8\times7}{7\times2\times8}=\frac{1}{2}\)
\(d,\frac{19}{14}\times\frac{7}{15}=\frac{19\times7}{7\times2\times15}=\frac{19}{30}\)
Học tốt
b . 3/7 . 16/33 + 16/33 . 4/7
= 16/33 . ( 3/7 + 4/7 )
= 16/33 . 7/7
= 16/33 . 1
= 16/33
c2 3/7 . 16/33 + 16/33 . 4/7
= 16/77 + 64/231
= 48/231 + 64/231
= 112/231
= 16/33
chúc em học giỏi !!!
a . 5/24 . 5/12 . 24
= ( 5/24 . 24 ) .5/12
= 5 . 5/12
= 25/12
C2 : 5/24 . 5/12 . 24
= 5/24 . ( 5/12 . 24 )
= 5/24 . 10
= 50/24
= 25/12
403 494 – 16 415) : 7 = 387 079 : 7 = 55 297
= 403 494 : 7 – 16 414 : 7
= 57 642 - 2345 = 55 297