x:15;x:20 và 50<x<70
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TL :
( 15 x 15 ) : 2 x ( 15 x 15 ) : 2 x ( 15 x 15 ) : 2 + ( 0 + 1 + 2 + 2 + 3 + 45 ) x 0
= 0
=> vì : tất cả số nào nhân vs 0 đều = 0
_HT_
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a,x:15+42=15+25x8
x:15+42=15+200
x:15+42 =250
x:15 =250-42
x:15 =208
x =208x15
x =3120
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15 x X + 15 x 2,7 = 15
15 x ( X + 2,7) = 15
X + 2, 7 = 15 : 15
X + 2,7 = 1
X = 1 - 2,7
X = - 1,7
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a: \(x\in\left\{45;60\right\}\)
b: \(x\in\varnothing\)
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15 x 20 - 15 x 10 + 15 x 40
= 15 x ( 20 - 10 + 40 )
= 15 x 50
= 750
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\(=\dfrac{4}{15}x\left(13+4-2\right)=\dfrac{4x15}{15}=4\)
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x + x = 15 x 15 = 225
x = 225 : 2 =112,5
15 con x là 112,5 x 15 =1687,5
x + x = 225
2 x = 225
x = 225 : 2
x = 112,5
Vậy 15 x = 112,5 x 15 = 1687, 5
Nhớ click cho mik nha !!!!!!!!!!
LG
vì \(\orbr{\begin{cases}x⋮15\\x⋮20\end{cases}\Rightarrow\orbr{\begin{cases}x\in B\left(15\right)\\x\in B\left(20\right)\end{cases}\Rightarrow}x\in BC\left(15;20\right)}\)
Ta có
15=3.5
20=22.5
\(\Rightarrow BCNN\left(15;20\right)=2^2.3.5=60\)
\(\Rightarrow x\in B\left(60\right)=\left\{0;60;120;180;...\right\}\)
mà 50<x,70
=>x=60
vậy x=60