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= y x (1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9) = 450
= y x 45 = 450
y = 10
Nho t ick cho mik
\(\frac{7}{8}\);\(\frac{4}{12}\);\(\frac{9}{18}\);\(\frac{14}{16}\);\(\frac{1}{2}\);\(\frac{1}{3}\);\(\frac{21}{24}\)
\(Ta\) sẽ rút gọn các phân số trên như sau và có một số phân số tối gian nên ko rút gọn nữa
TA giữ nguyên \(\frac{7}{8};\frac{1}{2};\frac{1}{3}\)
Ta có \(\frac{4}{12}=\frac{4:4}{12:4}=\frac{1}{3}\)
\(\frac{9}{18}=\frac{9:9}{18:9}=\frac{1}{2}\)
\(\frac{14}{16}=\frac{14:2}{16:2}=\frac{7}{8}\)
\(\frac{21}{24}=\frac{21:3}{24:3}=\frac{7}{8}\)
Ta thấy \(\frac{7}{8}=\frac{7}{8}=\frac{7}{8}\)
\(=>\) \(\frac{21}{24}=\frac{7}{8}=\frac{14}{16}\)
\(\frac{4}{12}=\frac{1}{3}\)
\(=>\frac{4}{12}=\frac{1}{3}\)
\(\frac{9}{18}=\frac{1}{2}\)
\(=>\frac{9}{18}=\frac{1}{2}\)
k mk nhé mk nhanh nhất
12/20=6/10=3/5
24/36=8/12=
3/4=9/12=12/16=15/20
2/5=4/10
12/30=4/10
72/45=8/5
1/4=7/28
\(\frac{2}{7}+\frac{5}{7}=\frac{7}{7}=1\)
\(\frac{8}{15}+\frac{6}{15}=\frac{14}{15}\)
\(\frac{2}{3}+\frac{3}{9}+\frac{4}{9}=\frac{6}{9}+\frac{3}{9}+\frac{4}{9}=\frac{9}{9}+\frac{4}{9}=\frac{13}{9}\)
\(\frac{4}{3x6}\)+ \(\frac{4}{6x9}\)+ \(\frac{4}{9x12}\)+ \(\frac{4}{12x15}\)
= \(\frac{4}{18}\)+ \(\frac{4}{54}\)+ \(\frac{4}{108}\)+ \(\frac{4}{180}\)
= \(\frac{2}{9}\)+ \(\frac{2}{27}\)+ \(\frac{1}{27}\)+ \(\frac{1}{45}\)
= \(\frac{2}{27}\)+ \(\frac{1}{27}\)+ \(\frac{2}{9}\)+ \(\frac{1}{45}\)
= \(\frac{1}{9}\)+ \(\frac{2}{9}\)+ \(\frac{1}{45}\)
=\(\frac{3}{9}\)+ \(\frac{1}{45}\)
= \(\frac{4}{45}\)
9/14:6/7 +3/12:2*1/2
=3/4+1/8:2*1/2
=3/4+1/16*1/2
=3/4+1/32
=25/32
\(\frac{9}{14}\): \(\frac{6}{7}\) + \(\frac{3}{12}\): \(2\)x\(\frac{1}{2}\)
= \(\frac{3}{4}\)\(+\)\(\frac{1}{8}\)x\(\frac{1}{2}\)
=\(\frac{3}{4}\)\(+\)\(\frac{1}{16}\)
=\(\frac{9}{16}\)\(+\)\(\frac{1}{16}\)
= \(\frac{10}{16}\)
=\(\frac{5}{8}\)
nhé
\(\frac{29}{12}:\frac{1}{2}-\frac{5}{12}:\frac{1}{2}-\frac{1}{2}\)
= \(\left(\frac{29}{12}-\frac{5}{12}\right):\frac{1}{2}-\frac{1}{2}\)
= \(2:\frac{1}{2}-\frac{1}{2}\)
= \(4-\frac{1}{2}\)
=\(\frac{8}{2}-\frac{1}{2}\)
=\(\frac{7}{2}\)
\(\left(\dfrac{3}{20}+\dfrac{1}{2}-\dfrac{1}{15}\right)\cdot\dfrac{12}{45}:\left(\dfrac{10}{3}+\dfrac{5}{9}\right)\)
\(=\left(\dfrac{9}{60}+\dfrac{30}{60}-\dfrac{4}{60}\right)\cdot\dfrac{4}{15}:\left(\dfrac{30}{9}+\dfrac{5}{9}\right)\)
\(=\dfrac{35}{60}\cdot\dfrac{4}{15}:\dfrac{35}{9}\)
\(=\dfrac{35}{60}\cdot\dfrac{15}{4}\cdot\dfrac{9}{35}=\dfrac{15}{60}\cdot\dfrac{9}{4}=\dfrac{1}{4}\cdot\dfrac{9}{4}=\dfrac{9}{16}\)