Câu hỏi của Minh Ngọc 5D - Tuệ Minh1...

Question

tìm x :a, x . $\dfrac{-5}{8}$ = $\dfrac{15}{32}$                             b, $\dfrac{3}{10}$ : x =$\dfrac{-9}{20}$c, $\dfrac{-1}{4}$ x  + $\dfrac{4}{5}$ =$\dfrac{3}{4}$               ...

YangSu · Accepted Answer

$a,x.\dfrac{-5}{8}=\dfrac{15}{32}$$\Leftrightarrow x=\dfrac{15}{32}:\dfrac{-5}{8}$$\Leftrightarrow x=\dfrac{15}{32}.\dfrac{-8}{5}$$\Leftrightarrow x=-\dfrac{3}{4}$$b,\dfrac{3}{10}:x=-\dfrac{9}{20}$$\Leftrightarrow x=\dfrac{3}{10}:\dfrac{-9}{20}$$\Leftrightarrow x=\dfrac{3}{10}.\dfrac{-20}{9}$$\Leftrightarrow x=-\dfrac{2}{3}$$c,-\dfrac{1}{4}x+\dfrac{4}{5}=\dfrac{3}{4}$$\Leftrightarrow-\dfrac{1}{4}x=\dfrac{3}{4}-\dfrac{4}{5}$$\Leftrightarrow-\dfrac{1}{4}x=-\dfrac{1}{20}$$\Leftrightarrow x=-\dfrac{1}{20}\times\left(-4\right)$$\Leftrightarrow x=\dfrac{1}{5}$$d,-\dfrac{7}{8}+\dfrac{2}{3}:x=\dfrac{3}{5}.\dfrac{-5}{12}$$\Leftrightarrow-\dfrac{7}{8}+\dfrac{2}{3}:x=-\dfrac{1}{4}$$\Leftrightarrow\dfrac{2}{3}:x=-\dfrac{1}{4}+\dfrac{7}{8}$$\Leftrightarrow\dfrac{2}{3}:x=\dfrac{5}{8}$$\Leftrightarrow x=\dfrac{2}{3}:\dfrac{5}{8}$$\Leftrightarrow x=\dfrac{16}{15}$Câu trả lời: $a,x.\dfrac{-5}{8}=\dfrac{15}{32}$$\Leftrightarrow x=\dfrac{15}{32}:\dfrac{-5}{8}$$\Leftrightarrow x=\dfrac{15}{32}.\dfrac{-8}{5}$$\Leftrightarrow x=-\dfrac{3}{4}$$b,\dfrac{3}{10}:x=-\dfrac{9}{20}$$\Leftrightarrow x=\dfrac{3}{10}:\dfrac{-9}{20}$$\Leftrightarrow x=\dfrac{3}{10}.\dfrac{-20}{9}$$\Leftrightarrow x=-\dfrac{2}{3}$$c,-\dfrac{1}{4}x+\dfrac{4}{5}=\dfrac{3}{4}$$\Leftrightarrow-\dfrac{1}{4}x=\dfrac{3}{4}-\dfrac{4}{5}$$\Leftrightarrow-\dfrac{1}{4}x=-\dfrac{1}{20}$$\Leftrightarrow x=-\dfrac{1}{20}\times\left(-4\right)$$\Leftrightarrow x=\dfrac{1}{5}$$d,-\dfrac{7}{8}+\dfrac{2}{3}:x=\dfrac{3}{5}.\dfrac{-5}{12}$$\Leftrightarrow-\dfrac{7}{8}+\dfrac{2}{3}:x=-\dfrac{1}{4}$$\Leftrightarrow\dfrac{2}{3}:x=-\dfrac{1}{4}+\dfrac{7}{8}$$\Leftrightarrow\dfrac{2}{3}:x=\dfrac{5}{8}$$\Leftrightarrow x=\dfrac{2}{3}:\dfrac{5}{8}$$\Leftrightarrow x=\dfrac{16}{15}$

Ng KimAnhh · Answer

a, $x\cdot\dfrac{-5}{8}=\dfrac{15}{32}$$x=\dfrac{15}{32}:\dfrac{-5}{8}$$x=\dfrac{-3}{4}$ b, $\dfrac{3}{10}:x=\dfrac{-9}{20}$$x=\dfrac{3}{10}:\dfrac{-9}{20}$$x=-\dfrac{2}{3}$ c, $\dfrac{-1}{4}x+\dfrac{4}{5}=\dfrac{3}{4}$$\dfrac{-1}{4}x=\dfrac{3}{4}-\dfrac{4}{5}$$\dfrac{-1}{4}x=-\dfrac{1}{20}$$x=-\dfrac{1}{20}:\dfrac{-1}{4}$$x=\dfrac{1}{5}$ d, $\dfrac{-7}{8}+\dfrac{2}{3}:x=\dfrac{3}{5}\cdot\dfrac{-5}{12}$$\dfrac{-7}{8}+\dfrac{2}{3}:x=-\dfrac{1}{4}$$\dfrac{2}{3}:x=-\dfrac{1}{4}+\dfrac{-7}{8}$$\dfrac{2}{3}:x=\dfrac{5}{8}$$x=\dfrac{2}{3}:\dfrac{5}{8}$$x=\dfrac{16}{15}$   #YVA6Câu trả lời: a, $x\cdot\dfrac{-5}{8}=\dfrac{15}{32}$$x=\dfrac{15}{32}:\dfrac{-5}{8}$$x=\dfrac{-3}{4}$ b, $\dfrac{3}{10}:x=\dfrac{-9}{20}$$x=\dfrac{3}{10}:\dfrac{-9}{20}$$x=-\dfrac{2}{3}$ c, $\dfrac{-1}{4}x+\dfrac{4}{5}=\dfrac{3}{4}$$\dfrac{-1}{4}x=\dfrac{3}{4}-\dfrac{4}{5}$$\dfrac{-1}{4}x=-\dfrac{1}{20}$$x=-\dfrac{1}{20}:\dfrac{-1}{4}$$x=\dfrac{1}{5}$ d, $\dfrac{-7}{8}+\dfrac{2}{3}:x=\dfrac{3}{5}\cdot\dfrac{-5}{12}$$\dfrac{-7}{8}+\dfrac{2}{3}:x=-\dfrac{1}{4}$$\dfrac{2}{3}:x=-\dfrac{1}{4}+\dfrac{-7}{8}$$\dfrac{2}{3}:x=\dfrac{5}{8}$$x=\dfrac{2}{3}:\dfrac{5}{8}$$x=\dfrac{16}{15}$   #YVA6

Ng Bảo Ngọc · Answer

$a,x.\dfrac{-5}{8}=\dfrac{15}{32}
$$x=\dfrac{15}{32}:\dfrac{-5}{8}$$x=\dfrac{-3}{4}$$b,\dfrac{3}{10}:x=\dfrac{-9}{20}$$x=\dfrac{3}{10}:\dfrac{-9}{20}$$x=\dfrac{-2}{3}$$c,\dfrac{-1}{4}.x+\dfrac{4}{5}=\dfrac{3}{4}$$\dfrac{-1}{4}.x=\dfrac{-1}{20}$$x=\dfrac{-1}{20}:\dfrac{-1}{4}$$x=\dfrac{1}{5}$$d,\dfrac{-7}{8}+\dfrac{2}{3}:x=\dfrac{3}{5}.\dfrac{-5}{12}$$\dfrac{-7}{8}+\dfrac{2}{3}:x=\dfrac{-1}{4}$$\dfrac{2}{3}:x=\dfrac{5}{8}$$x=\dfrac{16}{15}$$#yH$$#NBaoNgoc$Câu trả lời: $a,x.\dfrac{-5}{8}=\dfrac{15}{32}
$$x=\dfrac{15}{32}:\dfrac{-5}{8}$$x=\dfrac{-3}{4}$$b,\dfrac{3}{10}:x=\dfrac{-9}{20}$$x=\dfrac{3}{10}:\dfrac{-9}{20}$$x=\dfrac{-2}{3}$$c,\dfrac{-1}{4}.x+\dfrac{4}{5}=\dfrac{3}{4}$$\dfrac{-1}{4}.x=\dfrac{-1}{20}$$x=\dfrac{-1}{20}:\dfrac{-1}{4}$$x=\dfrac{1}{5}$$d,\dfrac{-7}{8}+\dfrac{2}{3}:x=\dfrac{3}{5}.\dfrac{-5}{12}$$\dfrac{-7}{8}+\dfrac{2}{3}:x=\dfrac{-1}{4}$$\dfrac{2}{3}:x=\dfrac{5}{8}$$x=\dfrac{16}{15}$$#yH$$#NBaoNgoc$

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