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a, \(\frac{1}{6}x+\frac{1}{10}-\frac{4}{15}x+1=0\)
\(\Leftrightarrow-\frac{1}{10}x=-\frac{11}{10}\)
\(\Leftrightarrow x=11\)
b,\(\left(\frac{1}{7}x-\frac{2}{7}\right)\left(-\frac{1}{5}x+\frac{3}{5}\right)\left(\frac{1}{3}x+\frac{4}{3}\right)=0\)
\(\Leftrightarrow\frac{1}{7}x-\frac{2}{7}=0\)hoặc \(-\frac{1}{5}x+\frac{3}{5}=0\)hoặc \(\frac{1}{3}x+\frac{4}{3}=0\)
+) \(\frac{1}{7}x-\frac{2}{7}=0\Leftrightarrow\frac{1}{7}x=\frac{2}{7}\Leftrightarrow x=2\)
+)\(-\frac{1}{5}x+\frac{3}{5}=0\Leftrightarrow-\frac{1}{5}x=-\frac{3}{5}\Leftrightarrow x=3\)
+)\(\frac{1}{3}x+\frac{4}{3}=0\Leftrightarrow\frac{1}{3}x=-\frac{4}{3}\Leftrightarrow x=-4\)
c, \(\frac{1}{2}x-\frac{11}{15}:\frac{33}{35}=-\frac{1}{3}\)
\(\Leftrightarrow\frac{1}{2}x-\frac{7}{9}=-\frac{1}{3}\)
\(\Leftrightarrow\frac{1}{2}x=\frac{4}{9}\)
\(\Leftrightarrow x=\frac{8}{9}\)
a/ \(\frac{1}{6}x+\frac{1}{10}-\frac{4}{15}x+1=0\)
\(\Rightarrow-\frac{1}{10}x=-\frac{11}{10}\)
\(\Rightarrow x=11\)
b/ \(\left(\frac{1}{7}x-\frac{2}{7}\right)\left(-\frac{1}{5}x+\frac{3}{5}\right)\left(\frac{1}{3}x+\frac{4}{3}\right)=0\)
\(\Rightarrow\frac{1}{7}x-\frac{2}{7}=0\Rightarrow\frac{1}{7}x=\frac{2}{7}\Rightarrow x=2\)
hoặc \(-\frac{1}{5}x+\frac{3}{5}=0\Rightarrow-\frac{1}{5}x=-\frac{3}{5}\Rightarrow x=3\)
hoặc \(\frac{1}{3}x+\frac{4}{3}=0\Rightarrow\frac{1}{3}x=-\frac{4}{3}\Rightarrow x=-4\)
Vậy x = 2, x = 3, x = -4
c/ \(\frac{1}{2}x-\frac{11}{15}:\frac{33}{35}=-\frac{1}{3}\)
\(\Rightarrow\frac{1}{2}x-\frac{7}{9}=-\frac{1}{3}\)
\(\Rightarrow\frac{1}{2}x=\frac{4}{9}\Rightarrow x=\frac{8}{9}\)
Vậy x = 8/9
\(a)\frac{1}{3}+\frac{-2}{5}+\frac{1}{6}+\frac{-1}{5}\le x< \frac{-3}{4}+\frac{2}{7}+\frac{-1}{4}+\frac{3}{5}+\frac{5}{7}\)
\(\Rightarrow\frac{1}{3}+\frac{1}{6}+\frac{-2}{5}+\frac{-1}{5}\le x< \frac{-3}{4}+\frac{-1}{4}+\frac{2}{7}+\frac{5}{7}+\frac{3}{5}\)
\(\Rightarrow\frac{2}{6}+\frac{1}{6}+\frac{-3}{5}\le x< -1+1+\frac{3}{5}\)
\(\Rightarrow\frac{1}{2}+\frac{-3}{5}\le x< \frac{3}{5}\)
\(\Rightarrow\frac{-1}{10}\le x< \frac{6}{10}\)
\(\Rightarrow-1\le x< 6\)
\(\Rightarrow x\in\left\{-1;0;1;2;3;4;5\right\}\)
Bài b tương tự
1)
a)
\(\frac{-5}{6}.\frac{120}{25}< x< \frac{-7}{15}.\frac{9}{14}\)
\(\frac{-1}{1}.\frac{20}{5}< x< \frac{-1}{5}.\frac{3}{2}\)
\(\frac{-20}{5}< x< \frac{-3}{10}\)
\(\frac{-40}{10}< x< \frac{-3}{10}\)
\(\Rightarrow Z\in\left\{-4;-5;-6;-7;-8;-9;-10;...;-39\right\}\)
Ta có : \(\frac{x+10}{27}=\frac{x}{9}\Leftrightarrow9x+90=27x\)
\(\Rightarrow90=27x-9x\)
\(\Rightarrow90=18x\)
\(\Rightarrow x=90:18=5\)
Vậy x = 5
\(\frac{x}{2}=\frac{3}{9}\)
\(\Leftrightarrow\frac{x}{2}=\frac{1}{3}\)
\(\Leftrightarrow3x=2\)
\(\Leftrightarrow x=\frac{2}{3}\)
b) \(\frac{x}{4}=\frac{-15}{12}=\frac{y+4}{16}\)(có lẽ đề như vậy)
\(\Rightarrow\frac{x}{4}=\frac{-15}{12}\)
\(\Rightarrow12x=-60\)
\(\Rightarrow x=-\frac{60}{12}=-5\)
\(\Rightarrow\frac{x}{4}=\frac{y+4}{16}\)
\(\Rightarrow16x=4y+16\)
\(\Rightarrow-80=4y+16\)
\(\Rightarrow4y=-96\)
\(\Rightarrow y=24\)
câu a hoàn toàn tương tự nên bạn làm nốt nhé!
a)Ta có:
\(\frac{y}{35}=-\frac{6}{14}\Rightarrow y=\frac{-6.35}{14}=-15\)
\(\frac{3}{x}=-\frac{15}{35}\Rightarrow x=\frac{3.35}{-15}=-7\)
Vậy: x=-15;y=-7
b)ta có:
\(\frac{x}{4}=-\frac{15}{12}\Rightarrow x=\frac{-15.4}{12}=-5\)
\(-\frac{15}{12}=\frac{y+4}{16}\Rightarrow y+4=\frac{-15.16}{12}=-20\Rightarrow y=-20-4=-24\)
Vậy x=-5; y=-24
a) Ta có: \(\frac{x}{5}=\frac{x+6}{15}\Rightarrow15x=5\left(x+6\right)\)
\(\Rightarrow15x=5x+30\)
\(\Rightarrow10x=30\)
=> x = 3
Vậy x = 3
b) \(\frac{x+10}{27}=\frac{x}{9}\Rightarrow9\left(x+10\right)=27x\)
\(\Rightarrow9x+90=27x\)
\(\Rightarrow18x=90\)
=> x = 5
Vậy x = 5
c) \(\frac{x+16}{35}=\frac{x}{7}\Rightarrow7\left(x+16\right)=35x\)
\(\Rightarrow7x+112=35x\)
\(\Rightarrow28x=112\)
=>x = 4
Vậy x = 4
NĂM MỚI AN LÀNH
ai làm nhanh mk sẽ cho và tặng quà nha nhớ để lại địa chỉ qua tết mk sẽ gửi