BÀI 1
1)3/11
2) -3/5
3)-4/7
4)5/-13
5) -9/-5
6)x thuộc {3;-3;6;-6;9;-9;12;-12}
bài 3:
52/71
-4/17
-5/29
-31/33
-4/3
5/7
-2/9
11/9
(tick hộ mặc dù làm ko đầy đủ )
thanks
\(\text{Bài 1:1)}3:11=\dfrac{3}{11}\)
\(\text{2)}\left(-3\right):5=\dfrac{-3}{5}\)
\(\text{3)}-4:7=\dfrac{-4}{7}\)
\(\text{4)}5:\left(-13\right)=\dfrac{5}{-13}\)
\(\text{5)}-9:\left(-5\right)=\dfrac{-9}{-5}\)
\(\text{6)}x\in\left\{3;-3;6;-6;9;-9;12;-12;...\right\}\)
\(\text{Bài 2:1)}\dfrac{x}{5}=\dfrac{6}{-10}\Rightarrow x=\dfrac{6.5}{-10}=-3\)
\(\text{2)}\dfrac{3}{y}=\dfrac{-33}{77}\Rightarrow y=\dfrac{77.3}{-33}=-7\)
\(\text{3)}\dfrac{x}{7}=\dfrac{6}{21}\Rightarrow x=\dfrac{6.7}{21}=2\)
\(\text{4)}\dfrac{-5}{y}=\dfrac{20}{28}\Rightarrow y=\dfrac{28.\left(-5\right)}{20}=-7\)
\(\text{Bài 3:}\dfrac{-52}{-71}=\dfrac{52}{71};\dfrac{4}{-17}=\dfrac{-4}{17};\dfrac{5}{-29}=\dfrac{-5}{29};\dfrac{31}{-33}=\dfrac{-31}{33};\dfrac{3}{-4}=\dfrac{-3}{4};\dfrac{-5}{-7}=\dfrac{5}{7};\dfrac{2}{-9}=\dfrac{-2}{9};\dfrac{-11}{-10}=\dfrac{11}{10}\)\(\text{ Bài 4:}\)
\(\dfrac{x}{5}=\dfrac{4}{y}=\dfrac{z}{-80}=\dfrac{42}{105}\)
\(\dfrac{x}{5}=\dfrac{42}{105}\Rightarrow x=\dfrac{42.5}{105}=2\)
\(\dfrac{4}{y}=\dfrac{42}{105}\Rightarrow y=\dfrac{105.4}{42}=10\)
\(\dfrac{z}{-80}=\dfrac{42}{105}\Rightarrow z=\dfrac{42.\left(-80\right)}{105}=-32\)
\(\dfrac{-4}{8}=\dfrac{x}{-10}=\dfrac{-7}{y}=\dfrac{z}{-24}\)
\(\dfrac{-4}{8}=\dfrac{x}{-10}\Rightarrow x=\dfrac{\left(-4\right).\left(-10\right)}{8}=5\)
\(\dfrac{-4}{8}=\dfrac{-7}{y}\Rightarrow\dfrac{\left(-7\right).8}{-4}=14\)
\(\dfrac{-4}{8}=\dfrac{z}{-24}\Rightarrow z=\dfrac{\left(-4\right).\left(-24\right)}{8}=12\)
