a, \(x\) \(\times\) 3 \(\times\) 5 = 2,7
b, \(1,2\) : \(x\) \(\times\) 4 = 20
4. Tìm x,y bt
a, (x^2-1)×(x^2-4)×(x^2-7)×(x^2-10)<0
b, (x^3 +5 )×(x^3+10)×(x^3+15)×(x^3+20)<0
I. Giải các phương trình sau
a)x-(x/2-3+x/4)/2 = 2x - (10x-7x/3)/2 - x -1
b) 3/10×(1,2- x)-5+7x/4=1/20×(9x+0,2) - 12,5x+4,5/5
II. Giải các phương trình sau
a) 25x - 655/95-5×(x-12)/209= 89-3x-2(x-18)/5
b)8×(x+22)/45{7x+149+[6×(x+12)/5]}/9 = [x+35+2×(x+50)/9]/5
c) [x+2(3-x)/5]/14- [5x - 4(x-1)]/24 = (7x+2+9-3x/5)/12 + 2/3
III. Giải phương trình sau:
(59-x/41) + (57-x/43) + (55-x/45) + (53-x/47) + (51-x/49)=-5
MỌI NGƯỜI GIÚP MÌNH VỚI Ạ. AI NHANH MÌNH TICK NHA
Tìm x
a)-29-9×(2x-1)mũ 2=-110
b)-2×(-x-5)+28=20-3×(x+4)
a, \(-29-9.\left(2x-1\right)^2=-110\)
\(\Rightarrow\left(2x-1\right)^2=\left[-29-\left(-110\right)\right]:9\)
\(\Rightarrow\left(2x-1\right)^2=9=3^2\)
\(\Rightarrow2x-1=9\)
\(\Rightarrow2x=9+1\)
\(\Rightarrow2x=10\)
\(\Rightarrow x=10:2\)
\(\Rightarrow x=5\)
b, tương tự nha bạn
tìm x :
a ) X * 3 ,9 + x * 0 , 1 = 2,7
b ) X * 3 + X * 5 = 9 , 84
c ) 12 , 3 : X - 4 , 5 : X = 15
d ) 7 * X - 2 * X = 1 ,85
a) X *(3,9 + 0,1) = 2,7
X *4 =27
X=27/4
X= 6,75
b)X * (3+5) = 9,84
X *8= 9,84
X=9,84/8
X= 1,23
Thu gọn
A)-2 1phần5×xy mũ 3×(-21/11×x mũ 3×mũ 2)
B)(4/5×x mũ 2×y mũ 5)mũ 2(5/2×x mux4×y) mũ 3
C)(-2/3×xy) mũ 2(-3/4×yz)
Tìm x
A, ( x - 1 )^x+2 = ( x - 1 )^x+4
B, 1/4 × 2/6 × 3/8 × 4/10 × 5/12 ×....× 30/62 × 31/64 = 2^x
\(A\left(x-1\right)^{x+2}=\left(x-1\right)^{x+4}\\\Leftrightarrow \left(x-1\right)^{x+4}-\left(x-1\right)^{x+2}=0\\ \Leftrightarrow\left(x-1\right)^{x+2}\left(\left(x-1\right)^{x+2}+1\right)=0\\ \Leftrightarrow\left(x-1\right)^{x+2}=0hoac\left(x-1\right)^{x+2}+1=0\)
Giả tiếp đc x=1
Tìm x
A, ( x - 3 ) ^2 = (-3)^2 + (-4)^2
B, -12 × ( x -5 ) + 7 × ( 3-x) = 5
C, 30 × ( x + 2) -6 × ( x-5 ) - 24 × x = 100
a) \(\left(x-3\right)^2\) = \(\left(-3\right)^2\) + \(\left(-4\right)^2\)
\(\left(x-3\right)^2=9+16\)
\(\left(x-3\right)^2=25\)
\(\left(x-3\right)^2=5^2\)
\(\Rightarrow x-3=5\)
\(\Rightarrow x=5+3=8\)
Vậy x = 8
b) -12 . (x - 5) +7 . (3 - x) = 5
-12x + 60 + 21 - 7x = 5
-12x - 7x = 5 - 60 - 21
-19x = -76
x = -76 : (-19) =4
Vậy x = 4
c) 30 . (x + 2) - 6 . ( x - 5) - 24x = 100
30x + 60 - 6x + 30 - 24x =100
30x - 6x - 24x = 100 - 30 - 60
0x = 10
x=10 : 0
\(\Rightarrow x\in\varnothing\)
A. x^2x - 3 - 2×5^2= 5^2×3
B. 5^x +1 = 125
C . ( 12x _ 4 ^3 ) × 8^3 = 4 × 8 ^4
D. X ^50 = x
A. 5x=6×(x-1)
B.1×(3x)=(x+1)×2
C.3×(2x+1)=5×(x+2)
D.5×(7-x)=-4×(8x-2)