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\(a.\dfrac{3\times4\times7}{12\times8\times9}=\dfrac{3\times4\times7}{3\times4\times4\times2\times9}\\ =\dfrac{7}{4\times2\times9}=\dfrac{7}{72}\\ b.\dfrac{4\times5\times6}{12\times10\times8}=\dfrac{4\times5\times2\times3}{4\times3\times5\times2\times4\times2}=\dfrac{1}{8}\\ c.\dfrac{5\times6\times7}{12\times14\times15}=\dfrac{5\times6\times7}{2\times6\times7\times2\times5\times3}\\ =\dfrac{1}{2\times2\times3}=\dfrac{1}{12}\)
\(a,\frac{10}{21}×\frac{14}{25}=\frac{4}{15}\)
\(b,3\frac{1}{3}×\frac{12}{35}=\frac{10}{3}×\frac{12}{35}=\frac{8}{7}\)
\(c,\frac{7}{15}×\frac{11}{13}+\frac{7}{15}×\frac{2}{13}+\frac{8}{15}=\frac{7}{15}+\frac{8}{15}=1\)
\(d,\left(\frac{41}{75}+\frac{17}{10}\right)×\frac{80}{129}=\frac{4}{9}\)
a) X=1/2 - 2/5=1/10
b)X=2/7+2/5=24/35
c)X=9/20:3/4=3/5
d)X=14x1/7=2
LUU Y : "/" la phan so
\(a.\left(\frac{6}{11}+\frac{5}{11}\right).\frac{3}{7}=1\cdot\frac{3}{7}=\frac{3}{7}b.\frac{3}{5}\cdot\frac{7}{9}+\frac{3}{5}\cdot\frac{2}{9}=\frac{3}{5}\cdot\left(\frac{7}{9}+\frac{2}{9}\right)=\frac{3}{5}\cdot1=\frac{3}{5}\)
12/14 + 15/20 + 6/7 + 3/4
= ( 12/14 + 6/7 ) + ( 15/20 + 3/4 )
= ( 6/7 + 6/7 ) + ( 3/4 + 3/4 )
= 12/7 + 6/4
= 48/28 + 42/28
= 90/28
= 45/14
Tham khảo nha !!!
\(\frac{3}{2}\times\frac{4}{5}\times\frac{2}{6}\times\frac{15}{4}\)
\(=\frac{6}{5}\times\frac{2}{6}\times\frac{15}{4}\)
\(=\frac{2}{5}\times\frac{15}{4}\)
\(=\frac{3}{2}\)
cô hoài ơi giúp em với
a) \(\frac{9}{14}\times\frac72\times\frac{8}{15}\)
\(=\frac{9\times7\times18}{14\times2\times15}\)
\(=\frac{3\times3\times7\times9\times2}{7\times2\times2\times3\times5}\)
\(=\frac{3\times9}{2\times5}=\frac{27}{10}\)
\(\frac{27}{40}\times10\times\frac{5}{18}\)
\(=\frac{27\times10\times5}{40\times18}\)
\(=\frac{3\times9\times10\times5}{10\times4\times2\times9}\)
\(=\frac{3\times5}{4\times2}=\frac{15}{8}\)
\(2+\frac{23}{100}\times25\)
\(=2+\frac{23\times25}{100}\)
\(=2+\frac{23\times25}{4\times25}\)
\(=\frac84+\frac{23}{4}=\frac{31}{4}\)
\(\frac{8}{21}\times\left(2+\frac14\right)\times7\)
\(=\frac{8}{21}\times\frac94\times7\)
\(=\frac{8\times9\times7}{21\times4}\)
\(=\frac{4\times2\times3\times3\times7}{3\times7\times4}\)
\(=2\times3=6\)
a)
\frac{9}{14} \times \frac{7}{2} \times \frac{8}{15}
Rút gọn:
= \frac{9 \times 4}{2 \times 15} = \frac{36}{30} = \frac{6}{5}
👉 Đáp án: \frac{6}{5}
b)
\frac{27}{40} \times 10 \times \frac{5}{18}
Rút gọn:
= \frac{3 \times 5}{4 \times 2} = \frac{15}{8}
👉 Đáp án: \frac{15}{8}
c)
2 + \frac{23}{100} \times 25
\frac{23}{100} \times 25 = \frac{575}{100} = \frac{23}{4}
2 + \frac{23}{4} = \frac{8}{4} + \frac{23}{4} = \frac{31}{4}
👉 Đáp án: \frac{31}{4}
d)
\frac{8}{21} \times \left(2 + \frac{1}{4}\right) \times 7
2 + \frac{1}{4} = \frac{9}{4}
\frac{8}{21} \times \frac{9}{4} \times 7
Rút gọn:
= \frac{2 \times 9}{3 \times 3} = \frac{18}{9} = 2
👉 Đáp án: 2
✅ Kết quả cuối: