Tìm x biết
70-5.(x-3)=45
Tìm số tự nhiên x,biết
70-5.(x-3)=45
10+2.x=45:43
2.x-138=23.32
231-(x-6)=1339:12
\(70-5\cdot\left(x-3\right)=45\)
\(\Rightarrow5\cdot\left(x-3\right)=70-45\)
\(\Rightarrow5\cdot\left(x-3\right)=25\)
\(\Rightarrow x-3=\dfrac{25}{5}\)
\(\Rightarrow x-3=5\)
\(\Rightarrow x=5+3=8\)
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\(10+2\cdot x=4^5:4^3\)
\(\Rightarrow10+2\cdot x=4^2\)
\(\Rightarrow10+2\cdot x=16\)
\(\Rightarrow2\cdot x=16-10\)
\(\Rightarrow2\cdot x=6\)
\(\Rightarrow x=\dfrac{6}{2}=3\)
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\(2\cdot x-138=2^3\cdot3^2\)
\(\Rightarrow2\cdot x-138=72\)
\(\Rightarrow2\cdot x=72+138\)
\(\Rightarrow2\cdot x=210\)
\(\Rightarrow x=\dfrac{210}{2}=105\)
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\(231-\left(x-6\right)=1339:12\)
\(\Rightarrow231-x+6=1339:12\)
\(\Rightarrow237-x=\dfrac{1339}{12}\)
\(\Rightarrow x=237-\dfrac{1339}{12}\)
\(\Rightarrow x=\dfrac{1505}{12}\)
Tìm x
\(\frac{3}{3+5}+\frac{3}{5+7}+\frac{3}{7+9}+...+\frac{3}{43+45}=\frac{x}{45}\)\(\frac{x}{45}\)
cho mình bỏ đi 1 phân số \(\frac{x}{45}\)ở cuối nhé
Tìm x, biết:
a) 3.x + 15 = 45
b) 45 - 5 . (x + 3) = 10
3.x+15=45 45-5.(x+3)=10
=>3.x=30 =>5.(x+3)=35
=>x=10 =>x+3=7
=>x=4
a) 3x + 15 = 45
<=> 3x = 30
<=> x = 10
b) 45 - 5(x+3) = 10
<=> 5(x+3) = 35
<=> x + 3 = 7
<=> x = 4
a) 3.x + 15 = 45
3.x = 45 - 15
3.x = 30
x = 30 : 3
x = 10
tìm x biết:
1) 14- (5-8+3-x) = |-7+10|
2) -19 - ?(3+x-5) = |4-15+2|
3) 45- (x+45-3) = |-7+3|
Tìm x
45 : x = 5 x : 3 = 135
45 : X =5 X : 3 = 135
X = 45 : 5 X = 135 x 3
X = 9 X = 405
Tìm x, biết:
a) (x – 45).27 = 0
b) 45.(2x – 4).13 = 0
c) (x – 3).(x – 5) = 0
a) (x – 45).27 = 0 ó x – 45 = 0 ó x = 45
b) 45.(2x – 4).13 = 0 ó 2x – 4 = 0 ó 2x – 4 = 0 ó 2x = 4 ó x = 2
c) (x – 3).(x – 5) = 0
Vậy tập nghiệm của phương trình là S = {3;5}
Tìm x:
2 (x-5) -3 (x+7)=14
-(-3-x+8)-(-3+5)=|15-8|
-5-8(4-x+5)=4+3+9
45-(x+45-3)=|-7+3|
Trả lời rõ ràng nha, nếu nhanh tay mk tick nhá
2(x-5)-3(x+7)=14
=> 2x-10-3x-21=14
=> x(2-3)-31=14
=> -x=14+31
=> -x=45
=> x=-45
70-5.(x-3)=45 tìm x
\(70-5\left(x-3\right)=45\)
\(\Rightarrow5\left(x-3\right)=30\)
\(\Rightarrow x-3=6\Rightarrow x=9\)
\(70-5\left(x-3\right)=45\)
\(\Leftrightarrow5\left(x-3\right)=25\)
\(\Leftrightarrow x-3=5\)
hay x=8
70-5(x -3)= -45 tìm x
70-5(x-3)=-45
=>5(x-3)=70+45=115
=>x-3=23
=>x=23+3=26
70 - 5(x - 3) = -45
=> 5(x - 3) = 70 - (-45)
=> 5(x - 3) = 115
=> x - 3 = 23
=> x = 26
Tìm x:Biết x+1+x+3+x+5=45
x + 1 + x + 3 + x + 5 = 45
( x + x + x ) + ( 1 + 3 + 5) = 45
3 x x ( mình sẽ viết là 3x nhá ) + 9 = 45
3x = 45 - 9
3x = 36
x = 36 : 3 = 12
vậy x = 12