5/6*2+3/7 : 2+ 4/7 *21/12
ai nhanh mn tick
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a] 4/12 ; 5/12 ; 11/2 ; 1/4
b] 1 ; 9/12; 12/5 ; 11/3
c] 8/21; 6/11;8/7
d] 2/3 ;2/7 15/2
a]1/3 5/12 11/2 1/4
b]1 3/4 12/5 33/9
c]8/21 6/11 8/7
d]2/3 2/7 15/2
\(\frac{-7}{21} +\left(1+\frac{1}{3}\right)\)
\(=\frac{-1}{3}+1+\frac{1}{3}=1\)
(dấu . là dấu nhân )
a, \(\frac{3}{2}\cdot\frac{4}{7}+\frac{3}{7}\cdot\frac{3}{2}\)
= \(\frac{3}{2}\left(\frac{4}{7}+\frac{3}{7}\right)\)
=\(\frac{3}{2}\cdot\frac{7}{7}=\frac{3}{2}\)
b, \(\frac{12}{5}\cdot4-4\cdot\frac{7}{5}\)
=\(4\left(\frac{12}{5}-\frac{7}{5}\right)=4\cdot\frac{5}{5}=4\)
c, \(\frac{5}{11}:\frac{1}{2}+\frac{6}{11}:\frac{1}{2}\)
=\(2\left(\frac{5}{11}+\frac{6}{11}\right)=2\cdot\frac{11}{11}=2\)
a;3/2x(4/7+3/7)
=3/2x1
=3/2
b;12/5x4-4x7/5
=4x(12/5-7/5)
=4x1
=4
c;5/11:1/2+6/11:1/2
=1/2:(5/11+6/11)
=1/2:1
=1/2
\(a,\frac{x}{6}=\frac{5}{24}\)
\(\Rightarrow\frac{4x}{24}=\frac{5}{24}\)
\(\Rightarrow4x=5\)
\(\Rightarrow x=\frac{5}{4}\)
\(b,\frac{-4}{x}=\frac{20}{14}\)
\(\Rightarrow\left(-4\right).14=20.x\)
\(\Rightarrow-56=20x\)
\(\Rightarrow x=-56\div20\)
\(\Rightarrow x=\frac{-14}{5}\)
\(c,\frac{4}{7}=\frac{12}{x}\)
\(\Rightarrow4.x=12.7\)
\(\Rightarrow4x=84\)
\(\Rightarrow x=84\div4\)
\(\Rightarrow x=21\)
\(d,\frac{3}{7}=\frac{x}{21}\)
\(\Rightarrow3.21=7.x\)
\(\Rightarrow63=7x\)
\(\Rightarrow x=63\div7\)
\(\Rightarrow x=9\)
các bn lm đến đâu cx dc miễn là lm hộ mk cái ạ, ai đang lm vào nhắn tin vs mk để mk bít nha
a; \(-\dfrac{8}{3}+\dfrac{7}{5}-\dfrac{71}{15}< x< -\dfrac{13}{7}+\dfrac{19}{14}-\dfrac{7}{2}\)
-\(\dfrac{19}{15}\) - \(\dfrac{71}{15}\) < \(x\) < -\(\dfrac{1}{2}\) - \(\dfrac{7}{2}\)
-6 < \(x\) < -4
vì \(x\) \(\in\) Z nên \(x\) = -5
5/6*2+3/7:2+4/7*21/12
= 5/6*2+3/7*1/2+4/7*21/12
= 5/3+7/6+1
= 23/6
K mk nha><
=5/3 + 3/14 + 1
=70/42 + 9/42 + 42/42
=121/42
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