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\(a.\dfrac{3\times4\times7}{12\times8\times9}=\dfrac{3\times4\times7}{3\times4\times4\times2\times9}\\ =\dfrac{7}{4\times2\times9}=\dfrac{7}{72}\\ b.\dfrac{4\times5\times6}{12\times10\times8}=\dfrac{4\times5\times2\times3}{4\times3\times5\times2\times4\times2}=\dfrac{1}{8}\\ c.\dfrac{5\times6\times7}{12\times14\times15}=\dfrac{5\times6\times7}{2\times6\times7\times2\times5\times3}\\ =\dfrac{1}{2\times2\times3}=\dfrac{1}{12}\)
Ta có: 272727x28 - 282828x27 = 27x10101x28 - 28x10101x27 = 0
Vậy, phép tính đã cho bằng 0
4) \(\frac{29x101-101}{2x19x101+4x101}\)
= \(\frac{\left(29-1\right)x101}{\left(38-4\right)x101}\)
=\(\frac{28}{34}=\frac{14}{17}\)
5) \(\left(\frac{2}{7}+\frac{11}{7}+\frac{1}{7}\right)-\frac{3}{8}-\frac{5}{8}+\frac{1}{3}\)
= \(\frac{14}{7}-\frac{8}{8}+\frac{1}{3}\)
= \(2-1+\frac{1}{3}=\frac{4}{3}\)
Nhớ tk cho mình nhé
1\(\frac{423133x846267+423134}{423133x846267+423134}=1\))
\(\frac{\left(423133+1\right)x846267-423133}{423133x846267+423134}\)
=\(\frac{423133x846267+846267-423133}{423133x846267+423134}\)
= \(\frac{423133x846267+423134}{423133x846267+423134}\)
= 1
Nhớ tk cho mình nhé (các câu sau làm riêng cho đỡ dài
\(a,\left(\frac{5}{7}+\frac{9}{7}\right)x\frac{21}{28}\)
\(C1:=\frac{14}{7}x\frac{21}{28}=\frac{3}{2}\)
\(C2:=\frac{5}{7}x\frac{21}{28}+\frac{9}{7}x\frac{21}{28}=\frac{15}{28}+\frac{27}{28}=\frac{3}{2}\)
\(b,\frac{4}{5}x\frac{13}{14}+\frac{13}{14}x\frac{1}{5}\)
\(C1:=\frac{26}{35}+\frac{13}{70}=\frac{13}{14}\)
\(C2:=\frac{13}{14}x\left(\frac{4}{5}+\frac{1}{5}\right)=\frac{13}{14}x1=\frac{13}{14}\)
học tốt ~~~
a) 17 x 4 - 4 + 4 x 1
= 4 x ( 17 - 1 + 1 )
= 4 x 17
=428
b) 1 x 1 + 1 x 13 + 1
= 1 x ( 1 + 13 + 1 )
=1 x 15
=15
2 x 6 + 2 x 6 + 2
=2 x ( 6 + 6 + 1 ))
=2 x 13
=26
17 x 4 - 4 + 4 x 1
=17 x 4 + 4 x 1 - 4
=4 x (17+1) - 4
=4 x 18 - 4
=72 - 4 = 68
2 x 5 - 5 + 5 x 2
=2 x 5 + 5 x 2 - 5
=10+10-5=15
b, 1x1+1x13+1
= 1+13+1 = 15
2x6+2x6+2
=12+12+2=26
bạn có chép sai đề k z ???
\(\left(1-\frac58\right)\cdot\left(1-\frac{5}{13}\right)\cdot\left(1-\frac{5}{18}\right)\cdot\ldots\cdot\left(1-\frac{5}{103}\right)\cdot\left(1-\frac{5}{108}\right)\)
\(=\frac38\cdot\frac{8}{13}\cdot\frac{13}{18}\cdot\ldots\cdot\frac{98}{103}\cdot\frac{103}{108}\)
\(=\frac{3}{108}=\frac{1}{36}\)
cao nhân, chưa muốn giải bài 🥱