3.
c, 5,7:0,35=(-x):0,45
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\(\dfrac{-x}{0.45}=\dfrac{5.7}{0.35}\)
\(\Leftrightarrow x=\dfrac{-5.7\cdot0.45}{0.35}=-\dfrac{513}{70}\)
Ta có :
\(\frac{5,7}{3,5}=-\frac{x}{0,45}\)
\(\Rightarrow x=\frac{5,7}{3,5}.\left(-0,45\right)\)
\(\Rightarrow x=-\frac{513}{700}\)
Vậy x = - 513 / 700
\(5,7:0,35=\left(-x\right):0,45\)
\(\Leftrightarrow-x=\frac{5,7\cdot0,45}{0,25}=10.26\)
\(\Leftrightarrow x=-10,26\)
a)\(\dfrac{x}{7}=\dfrac{18}{14}\)
\(\Rightarrow x=\dfrac{7.18}{14}=9\)
b)\(6:x=1\dfrac{3}{4}\)
\(\Leftrightarrow\dfrac{6}{x}=\dfrac{7}{4}\)
\(\Rightarrow x=\dfrac{6.4}{7}=\dfrac{24}{7}\)
c)5,7:0,35=(-x):0,45
\(\Leftrightarrow\dfrac{114}{7}=\dfrac{-x}{0,45}\)
\(\Rightarrow\left(-x\right)=\dfrac{114.0,45}{7}=\dfrac{-513}{70}\)
a/ \(\dfrac{x}{7}=\dfrac{18}{14}\)
\(\Leftrightarrow14x=7.18\)
\(\Leftrightarrow14x=126\)
\(\Leftrightarrow x=9\)
Vậy ....
b/ \(6:x=1\dfrac{3}{4}:5\)
\(\Leftrightarrow6:x=\dfrac{7}{20}\)
\(\Leftrightarrow x=\dfrac{120}{7}\)
Vậy ...........
Ta có: \(\frac{5,7}{0,35}=\frac{\left(-x\right)}{0,45}\)
\(\Rightarrow5,7.0,45:0,35=\left(-x\right)\)
\(\Rightarrow2,565:0,35=\left(-x\right)\)
\(\Rightarrow\left(-x\right)=7,3\left(285714\right)\)
Vậy x = -7,3 (285714)
5,7/0,35=(-x)/0,45
=>5,7x0,45=0,35x(-x)
=>0,35x(-x)=2,565
=>(-x)=2,565:0,35
=> x= 2,565: (-0,35)
=>x gần bằng 7,35
\(a,x=\dfrac{18.7}{14}\)
\(x=\dfrac{8}{2}=4\)
\(b,\)\(x=6.5:1\dfrac{3}{4}\)
\(x=30:\dfrac{7}{4}\)
\(x=30.\dfrac{4}{7}=\dfrac{120}{7}\)
\(c,-x=\)\(\dfrac{5,7.0,45}{0,35}\)
\(-x=\)\(\dfrac{2,565}{0,35}\)
\(x=\dfrac{-2,565}{0,35}\)
a)\(\dfrac{x}{7}=\dfrac{18}{14}\) b) 6:x=\(1\dfrac{3}{4}\):5 c) 5,7 : 0,35= -x: 0,45
\(\Rightarrow\) x.14= 18.7 \(\Rightarrow\) 6:x=\(\dfrac{7}{20}\) \(\Rightarrow\)\(\dfrac{114}{7}=\dfrac{-x}{0,45}\)
\(\Rightarrow\)x.14=126 \(\Rightarrow\)x=\(\dfrac{10}{21}\) \(\Rightarrow53,1=\left(-x\right).7\)
\(\Rightarrow\)x=9 \(\Rightarrow x=7,3\)
CHÚC BẠN HỌC TỐT
a) \(\frac{x}{7}=\frac{18}{14}\)
\(\frac{x}{7}=\frac{9}{7}\)
\(\Rightarrow x=9\)
b) \(6:x=1\frac{3}{4}:5\)
\(6:x=\frac{7}{4}.\frac{1}{5}\)
\(6:x=\frac{7}{20}\)
\(x=6:\frac{7}{20}\)
\(x=\frac{120}{7}\)
vay \(x=\frac{120}{7}\)
c) \(\frac{5,7}{0,35}=\frac{-x}{0,45}\)
\(\Rightarrow-0,35x=5,7.0,45\)
\(\Rightarrow-0,35x=2,565\)
\(\Rightarrow x=\frac{-2,565}{0,35}\)
\(\Rightarrow x=\frac{-513}{70}\)
vay \(x=\frac{-513}{70}\)
\(5,7:0,35=\left(-x\right):0,45\)
\(\frac{114}{7}=\left(-x\right):\frac{9}{20}\)
\(-x=\frac{114}{7}.\frac{9}{20}\)
\(-x=7\frac{23}{70}\)
\(x=-7\frac{23}{70}\)
Vậy \(x=-7\frac{23}{70}\)