40 404 / 70 707 - 1/14
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\(\left(\frac{505}{707}+\frac{222}{333}\right)\cdot x=\frac{404}{909}\)
=> \(\left(\frac{5}{7}+\frac{2}{3}\right)\cdot x=\frac{4}{9}\)
=> \(\frac{29}{21}\cdot x=\frac{4}{9}\)
=> \(x=\frac{4}{9}:\frac{29}{21}\)
=> \(x=\frac{28}{87}\)
TK mk nha!
( 505/707+ 222/333) . x = 404/ 909
29/21 . x = 4/9
x= 4/9 : 29/21
x= 4/9 . 21/29
x= 28/87
Vậy x= 28/87
Số số hạng là: \(\dfrac{770-7}{7}+1=110-1+1=110\left(số\right)\)
Tổng của dãy số là:
\(\left(770+7\right)\cdot\dfrac{110}{2}=42735\)
525:2=(x+70):14-40
262,5=(x+70):14-40
Ta có:(x+70):14-40=262,5
(x+70):14 =262,5+40
(x+70):14 =302,5
x+70 =302,5*14
x+70 =4235
x+70
\(\left(32.15\right):2=\left(x+70\right):14-40\)
\(480:2=\left(x+70\right):14-40\)
\(240=\left(x+70\right):14-40\)
\(240-40=\left(x+70\right):14\)
\(200=\left(x+70\right):14\)
\(200.14=x+70\)
\(2800=x+70\)
\(2800-70=x\)
\(2730=x\)
\(\left(32\cdot15\right):2=\left(x+70\right):14-40\)
\(=240=\left(x+70\right):14-40\)
\(\Rightarrow\left(x+70\right):14=240+40\)
\(\Rightarrow x+70=280\cdot14\)
\(\Rightarrow x=3920-70\)
\(\Rightarrow x=3850\)
Ủng hộ mk nkoa!@^_^@
(32.15):2=(x+70):14-40
=>(x+70):14-40=480:2=240
=>(x+70):14=240+40=280
=>x+70=280x14=3920
=>x=3920-70=3850
(32.15):2=(x+70):14-40
=>480:2=(x+70):14-40
=>240=(x+70):14-40
=>(x+70):14=240+40
=>(x+70):14=280
=>x+70=280*14
=>x+70=3920
=>x=3850
a) \(\Rightarrow5\left(x-10\right)=10\)
\(\Rightarrow x-10=2\Rightarrow x=12\)
b) \(\Rightarrow3\left(70-x\right)+5=92\)
\(\Rightarrow3\left(70-x\right)=87\)
\(\Rightarrow70-x=29\Rightarrow x=41\)
c) \(\Rightarrow230+\left[16+\left(x-5\right)\right]=315\)
\(\Rightarrow11+x=85\Rightarrow x=74\)
d) \(\Rightarrow707:\left(2^x-5+74\right)=7\)
\(\Rightarrow2^x-5+74=101\Rightarrow2^x-5=27\)
\(\Rightarrow2^x=32\Rightarrow x=5\)
(x+70):14-40= 240
(x+70):14=240+40
(x+70) :14+280
x+70=280x14
x+70=3920
x=3920-70
x=3850
\(\dfrac{40404}{70707}-\dfrac{1}{14}\)
\(=\dfrac{4}{7}-\dfrac{1}{14}\)
\(=\dfrac{8}{14}-\dfrac{1}{14}=\dfrac{7}{14}=\dfrac{1}{2}\)