450 : 5
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\(\frac{450}{x+5}+1=\frac{450}{x}\)
\(\Leftrightarrow\frac{450x}{x\left(x+5\right)}+\frac{x\left(x+5\right)}{x\left(x+5\right)}=\frac{450\left(x+5\right)}{x\left(x+5\right)}\)
Khử mẫu : \(\Leftrightarrow450x+x^2+5x=450x+2250\)
\(\Leftrightarrow455x+x^2-450x-2250=0\)
\(\Leftrightarrow x^2-5x-2250=0\)delta nốt hộ
a, 450 - 5x = 75
5x = 450 - 75
5x = 375
x = 75
Vậy...
b, ( 450 - 5x ) . 15 = 75
450 - 5x = 5
5x = 445
x = 89
Vậy ...
c, ( 450 - x ) : 15 = 150
450 - x = 2250
x = 450 - 2250
x = -1800
Vậy...
a) 450 -5 x X =75 b) ( 450 - 5 x X ) x15 =75 c) ( 450 - X ) : 15 =150
5 x X =450-75 450 - 5 x X =75 : 15 450 - X =150x15
5 x X =375 450 - 5 x X =5 450 - X =2250
X=375:5 5 x X =450:5 X =450-2250
X=75 5 x X =90 X =-1800
X =90:5
X =18
7 x 450 - 900 + 450 x 5
= 7 x 450 - 450 x 2 + 450 x 5
= 450 x (7 - 2 + 5)
= 450 x 10
= 4500
7 x 450 - 900 + 450 x 5
= 450 x 7 + 450 x 5 - 450 x 2
= 450 x (7 + 5 - 2)
= 450 x (12 - 2)
= 450 x 10
= 4500
312 + (146 -X ) =401
11- (15 + 21 ) + X- (25-9)
2- X +177 - (-5)
X -12 = (-9) - 15
\(600:\left\{450:\left[450-\left(4.5^3-2^3.5^2\right)\right]\right\}\)
\(=600:\left\{450:\left[450-\left(4.125-8.25\right)\right]\right\}\)
\(=600:\left\{450:\left[450-\left(500-200\right)\right]\right\}\)
\(=600:\left\{450:\left[450-300\right]\right\}\)
\(=600:\left\{450:150\right\}\)
\(=600:3\)
\(=200\)
B = 600 : { 450 : [450 - ( 4 . 53 - 23 . 52 ) ] }
B = 600 : { 450 : [ 450 - ( 4 . 125 - 8 . 25 ) ] }
B = 600 : { 450 : [ 450 - ( 500 - 200 ) ] }
B = 600 : { 450 : [ 450 - 300 ] }
B = 600 : { 450 : 150 }
B = 600 : 3
B = 200
\(B=600:\left\{450:\left[450-\left(4.5^3-2^3.5^2\right)\right]\right\}\)
\(B=600:\left\{450:\left[450-300\right]\right\}\)
\(B=600:\left(450:150\right)\)
\(B=600:3\)
\(B=200\)
\(450:\left[41-\left(2x-5\right)\right]=3^2\cdot5\\ \Rightarrow41-\left(2x-5\right)=450:45=10\\ \Rightarrow2x-5=41-10=31\\ \Rightarrow2x=36\\ \Rightarrow x=18\)
\(450:\left[41-\left(2x-5\right)\right]=3^2.5\)
\(\Leftrightarrow450:\left(41-2x+5\right)=45\)
\(\Leftrightarrow46-2x=10\)
\(\Leftrightarrow2x=36\Leftrightarrow x=18\)
băng 90 ..ủng hộ nha
450 : 5 = 90
Chúc bạn học giỏi nhé !