1,25 x X + 3,75 x X =10
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5 *x + 3,75 *x + 1,25 *x= 20
<=>x* (5+3,75+1,25) =20
<=>x* 10 =20
<=>x = 20:10
<=>x =2
5 x X + 3,75 x X + 1,25 x X = 20
X x (5+3,75+1,25) =20
X x 10 =20
X=20:10
X=2
5 x \(x\)+3,75 x \(x\)+1,25 x \(x\)=20
=> \(x\)x(5+3,75+1,25)=20
=>\(x\)x 10=20
=>x=20:10
=> x=2
vậy \(x\)=2
a) y x 3,75 + y x 1,25 = 120
( 3,75 + 1,25 ) x y = 120
5 x y = 120
y = 120 : 5
y = 24
b) y x 0,1 = 45,7 + 34,5
y x 0,1 = 80,2
y = 80,2 : 0,1
y = 802
a)=y*(3,75+1,25)=120
=y*5,05=120
y=120:5,05=
b)y*0,1=80,2
=80,2:0,1
Còn lại tự tính nhé
x.0,9 = 4-0,022
x.0,9= 3,978
x= 4,42
4,27 - x = 13,5 : 45
4,27 - x = 0,3
x = 3,97
x: 0,1 + x : 0,01 = 2,2
x : ( 0,1+ 0,01)=2,2
x : 0,11= 2,2
x = 0,242
x *0,9=3,978
x =3,978/0,9
x =4,42
4,27-x=13,5/45
4,27-x=0,3
x=4,27-0,3
x=3,97
x/0,1+x/0,01=2,2
x/0,11=2,2
x=2,2x0,11
x=0,242
3,75+1,25*x=4
1,25*x=4-3,75
1,25*x=0,25
x=0,25/1,25
x=0,2
3,75+1,25 *x=3/4
3,75+1,25*x=0,75
1,25*x=0,75-3,75
1,25*x=-3
x=-3/1,25
x=-2,4
\(\left(84,6-2\cdot x\right):3,02=5,1\)
\(\Rightarrow84,6-2\cdot x=15,402\)
\(\Rightarrow2\cdot x=69,198\)
\(\Rightarrow x=69,198:2\)
\(\Rightarrow x=34,599\)
_____________
\(\left(15\cdot24-x\right):0,25=100:0,25\)
\(\Rightarrow\left(360-x\right):0,25=400\)
\(\Rightarrow360-x=100\)
\(\Rightarrow x-360-100\)
\(\Rightarrow x=260\)
______________
\(128\cdot x-12\cdot x-16\cdot x=5200\)
\(\Rightarrow x\cdot\left(128-12-16\right)=5200\)
\(\Rightarrow x\cdot100=5200\)
\(\Rightarrow x=5200:100\)
\(\Rightarrow x=52\)
__________________
\(5\cdot x+3,75\cdot x+1,25\cdot x=20\)
\(\Rightarrow x\cdot\left(5+3,75+1,25\right)=20\)
\(\Rightarrow10\cdot x=20\)
\(\Rightarrow x=20:10\)
\(\Rightarrow x=2\)
\(x\cdot3,7+x\cdot6,3=360:120\)
\(\Rightarrow x\cdot\left(3,7+6,3\right)=3\)
\(\Rightarrow x\cdot10=3\)
\(\Rightarrow x=\dfrac{3}{10}\)
__________________
\(x\cdot23-6\cdot23+x\cdot69=320\)
\(\Rightarrow x\cdot\left(23+69\right)=320+6\cdot23\)
\(\Rightarrow x\cdot92=458\)
\(\Rightarrow x=458:92\)
\(\Rightarrow x=\dfrac{229}{46}\)
___________________
\(\left(x+1\right)\left(x+2\right)=72\)
\(\Rightarrow x^2+2x+x+2=72\)
\(\Rightarrow x^2+3x+2=72\)
\(\Rightarrow x^2+3x+2-72=0\)
\(\Rightarrow x^2+3x-70=0\)
\(\Rightarrow x^2+10x-7x-70=0\)
\(\Rightarrow\left(x-7\right)\left(x+10\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x=7\\x=-10\end{matrix}\right.\)
___________________
\(\left(x+2\right)\cdot16\cdot x=160x\)
\(\Rightarrow16x^2+32x=160x\)
\(\Rightarrow16x^2+32x-160x=0\)
\(\Rightarrow16x^2-128x=0\)
\(\Rightarrow16x\left(x-8\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x=0\\x=8\end{matrix}\right.\)
1,25xX+3,75xX=10
Xx(1,25+3,75)=10
Xx5=10
X=10:5
X=2