Ai giúp mình
24/28×12/13=.../7*12/...=.../91
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Trả lời:
\(\frac{32}{28}\times\frac{7}{6}=\)\(\frac{8}{7}\times\frac{7}{6}=\)\(\frac{56}{42}=\frac{4}{3}\)
^_^
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Trả lời:
32/28x7/6=8/7x7/6=56/42=4/3
hok tốt !
k cho mik nhé
^_^
\(D=\frac{n-12}{n-5}\)
Ta có :\(D=\frac{n-5-7}{n-5}\)
\(D=\frac{n-5}{n-5}-\frac{7}{n-5}\)
\(\Rightarrow D=1-\frac{7}{n-5}\)
Để \(D\in z\)
\(\Rightarrow7⋮n-5\)
\(\Rightarrow n-5\inƯ\left(7\right)=\left(-7;7;1;-1\right)\)
\(\Rightarrow n\in\left(-2;12;6;4\right)\)
Vậy để \(D\in Z\)
thì \(n\in\left(-2;12;6;4\right)\)
\(E=\frac{2n+14}{n+4}\)
\(E=\frac{2n+8+6}{n+4}=\frac{2\left(n+4\right)+6}{n+4}\)
\(E=2+\frac{6}{n+4}\)
suy ra để \(\frac{2n+13}{n+4}\in Z\)
thì \(6⋮n+4\)
Vậy \(n+4\inƯ\left(6\right)=\left(-6;6;3;-3;2;-2;1;-1\right)\)
\(\Rightarrow n\in\left(-10;2;-1;-7;-2;-3;-5\right)\)
Vậy để \(E\in Z\)
thì \(n\in\left(-10;2;-1;-7;-2;-3;-5\right)\)
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\(\frac{1.3.5+2.6.10+4.12.20+7.21.35}{1.5.7+2.10.14+4.20.28+7.35.49}\)
\(=\frac{1.3.5\left(1+2+4+7\right)}{1.5.7\left(1+2+7+7\right)}=\frac{1.3.5}{1.5.7}=\frac{15}{35}=\frac{3}{7}\)
\(\frac{1\cdot3\cdot5+2\cdot6\cdot10+4\cdot12\cdot20+7\cdot21\cdot35}{1\cdot5\cdot7+2\cdot10\cdot14+4\cdot20\cdot28+7\cdot35\cdot49}\)
\(=\)\(\frac{1\cdot3\cdot5\cdot\left(1+2+4+7\right)}{1\cdot5\cdot7\cdot\left(1+2+7+7\right)}\)
\(=\frac{1\cdot3\cdot5}{1\cdot5\cdot7}\)\(=\frac{15}{35}=\frac{3}{7}\)
bn vội quá viết nhầm lun kìa
hj hj chúc bn làm bài tốt nha
sg8xcjvjbjbjnvnbnjbjbjbjbjjjgggggggggggggggggggggggggggggggggggggggggggggnnnnnnn mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm
768 x 87 + 12 x 768 + 768
= 768 x 87 + 12 x 768 + 768 x 1
= 768 x ( 87 + 12 + 1 )
= 768 x 100
= 76800
Mk nhanh nhất đó
\(768\times87+12\times768+768\)
\(=768\times\left(87+12+1\right)\)
\(=768\times100\)
\(=76800\)
k mk nha
mk nhanh nhất đó
Ta có:\(\left(-12\right)+\left(-13\right)+36+\left(-11\right)=\left(-12-13-11\right)+36\)
\(=\left(-36\right)+36\)
\(=0\)
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
\(\frac{7}{8}\);\(\frac{4}{12}\);\(\frac{9}{18}\);\(\frac{14}{16}\);\(\frac{1}{2}\);\(\frac{1}{3}\);\(\frac{21}{24}\)
\(Ta\) 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
24/28x12/13=6/7*12/13=72/91
học tốt!!!!!!!!!!!!
24/28\(\times\)12/13=6/7*12/13=72/91