2/5 :x=7/10 tìm x
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x+2/5=10/7:5/7
x+2/5=2
x=2-2/5
x=8/5
tích đúng cho mình nha nguyến việt anh!^_^
a -7.(5-x) -2.(x-10)=15
= -35+7x-2x+20=15=5x=30
5x=30
x=6
b 10.(x-7)-8.(x+5)=6.(-5)+24
=10x-70-8x-40= -30+24
=10x-8x = -30+24+70+40
2x = 104
x = 104:2
x = 52
\(a)-7\left(5-x\right)-2\left(x-10\right)=15\)
\(\Rightarrow-35+7x-2x+20=15\)
\(\Rightarrow-35+20+7x-2x=15\)
\(\Rightarrow-15+5x=15\)
\(\Rightarrow5x=30\Rightarrow x=6\)
\(b)10\left(x-7\right)-8\left(x+5\right)=6\left(-5\right)+24\)
\(\Rightarrow10x-70-8x-40=-30+24\)
\(\Rightarrow10x-8x-70-40=-6\)
\(\Rightarrow2x-110=-6\)
\(\Rightarrow2x=104\Rightarrow x=52\)
Vậy\(a)x=6b)x=52\)
1) <=> 8x-16-21-7x=-4
<=> x-37=-4
<=> x=33
2) <=> 12x-48+6x-12-16x-48=-28
<=> 2x-108=-28
<=> 2x = 80
<=> x = 40
3)<=> 4x-20-35+7x+50-10x=-3
<=> x-5=-3
<=> x=2
4) <=> -3x-15=-45-21
<=> 51=3x
<=> 17=x
5) 4x-28+15=-2x+14-10
<=> 6x-13=4
<=> 6x=17
<=> x = \(\frac{17}{6}\)
Chúc bạn học tốt
\(\frac{x}{2}-\left(\frac{3x}{5}-\frac{13}{5}\right)=-\left(\frac{7}{5}+\frac{7}{10}.x\right)\)
\(\frac{x}{2}-\frac{3x-13}{5}=-\frac{14+7x}{10}\)
\(\frac{5x}{10}-\frac{2\left(3x-13\right)}{10}=-\frac{14+7x}{10}\)
\(\frac{5x-6x-26}{10}=\frac{-14-7x}{10}\)
\(\Rightarrow10.\left(5x-6x-26\right)=\left(-14-7x\right).10\)
\(\Rightarrow50x-60x-260=-140-70x\)
\(\Rightarrow-10x-260=-140-70x\)
\(\Rightarrow-10x+70x=-140+260\)
\(\Rightarrow60x=120\)
\(\Rightarrow x=2\)
\(\frac{x}{2}-\left(\frac{3x}{5}-\frac{13}{5}\right)=-\left(\frac{7}{5}+\frac{7}{10}x\right)\)
\(\Leftrightarrow\frac{x}{2}-\frac{3x}{5}+\frac{13}{5}=-\frac{7}{5}-\frac{7}{10}x\)
\(\Leftrightarrow\frac{x}{2}-\frac{3x}{5}=-\frac{7}{10}x-4\)
\(\Leftrightarrow-\frac{7}{10}x-\frac{x}{2}+\frac{3x}{5}=4\)
\(\Leftrightarrow x\left(-\frac{7}{10}-\frac{1}{2}+\frac{3}{5}\right)=4\)
\(\Leftrightarrow x\left(-\frac{3}{5}\right)=4\)
\(\Leftrightarrow x=-\frac{20}{3}\)
\(\dfrac{2}{5}:x=\dfrac{7}{10}\)
\(x=\dfrac{2}{5}:\dfrac{7}{10}=\dfrac{2}{5}\cdot\dfrac{10}{7}\)
\(x=\dfrac{2\cdot5\cdot2}{5\cdot7}\)
\(x=\dfrac{4}{7}\)
x = 2/5 : 7/10
x = 4/7
HT