tìm x
84: x -6 = 15
93+7 : x = 112
98 - ( x + 23 )= 37
( x+ 200 ) : 4 = 460 +85 *4
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\(x-\frac{15}{95}+x-\frac{17}{93}+x-\frac{23}{87}+x-\frac{37}{73}=4\)
\(\Rightarrow x+x+x+x-\frac{15}{95}-\frac{17}{93}-\frac{23}{87}-\frac{37}{73}=4\)
\(\Rightarrow4x-\)\(\left(\frac{15}{95}+\frac{17}{93}+\frac{23}{87}+\frac{37}{73}\right)=4\)
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\(\frac{x-15}{95}+\frac{x-17}{93}+\frac{x-23}{87}+\frac{x-37}{73}=4\)
\(\Leftrightarrow\frac{x-15}{95}+\frac{x-17}{93}+\frac{x-23}{87}+\frac{x-37}{73}-4=0\)
\(\Leftrightarrow\left(\frac{x-15}{95}-1\right)+\left(\frac{x-17}{93}-1\right)+\left(\frac{x-23}{87}-1\right)+\left(\frac{x-37}{73}-1\right)=0\)
\(\Leftrightarrow\frac{x-15-95}{95}+\frac{x-17-93}{93}+\frac{x-23-87}{87}+\frac{x-37-73}{73}=0\)
\(\Leftrightarrow\frac{x-110}{95}+\frac{x-110}{93}+\frac{x-110}{87}+\frac{x-110}{73}=0\)
\(\Leftrightarrow\left(x-110\right)\left(\frac{1}{95}+\frac{1}{93}+\frac{1}{87}+\frac{1}{73}\right)=0\)
\(\Leftrightarrow x-110=0\)
\(\Leftrightarrow x=110\)
a.460+340=(x-200)x4
800=(x-200)x4
800:4=x-200
200=x-200
x=200+200
x=400
b.x=53
\(5.\left(x+35\right)=515\)
\(\Rightarrow x+35=515:5\)
\(\Rightarrow x+35=103\)
\(\Rightarrow x=103-35\)
\(\Rightarrow x=68\)
Mấy câu còn lại tương tự nhé !
460 + 85 x 4 = ( x + 200 ) x 4
460 + 340 = ( x + 200 ) x 4
800 = ( x + 200 ) x 4
800 = x + ( 200 x 4 )
800 = x + 800
x = 800 - 800
x = 0
a) 460 + 85.4 = ( x + 200 ) : 4
=> x = 3000
b) => x = 2595
c) => x = 50
d) => x = 40
a)460 +85 . 4 = (x+200) :4 b)x:15+42=15+25.8
suy ra : 460+340=(x+200):4 suy ra: x:15+42=15+200
suy ra: 800= (x+200):4 suy ra : x:15+42=215
suy ra : 800.4=x+200 suy ra: x:15=215-42
suy ra : 3200=x+200 suy ra : x:15=173
suy ra: x= 3200-200 suy ra : x=173.15
suy ra : x=3000 vậy x =3000 suy ra: x=2595 vậy x = 2595
c) x-32:16=48 d)x-6:2-(48-24.2:6-3)=0
suy ra :x-2=48 suy ra : x-6:2-(48-48:6-3)=0
suy ra :x=48+2 suy ra : x-6:2-(48-8-3)=0
suy ra : x=50 suy ra : x-6:2-(40-3)=0
vậy x=50 suy ra : x-6:2 - 37=0
suy ra : x-3-37=0
suy ra : x-3=0+37
suy ra : x-3=37
suy ra : x=37+3
suy ra :x=40 vậy x= 40
93 + 7 : x = 112
7 : x = 112 - 93
7 : x = 19
x = 7 : 19
x = 7/19
84 : x - 6 = 15
84 : x = 16 + 5
84 : x = 21
x = 84 : 21
x = 4