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= x * 30 + (1+2+3+4+...+30)=1240
= x * 30 + 465 = 1240
= x * 30 = 1240 - 465
còn lại tự tính nha
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\(\frac{2}{x}=\frac{5}{6}\Rightarrow2.6=5.x\Rightarrow x=12:5=\frac{12}{5}\)
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\(125\div x+375\div x-200\div x=12\)
\(\left(125+375-200\right)\div x=12\)
\(300\div x=12\)
\(x=25\)
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3x + 5x + 7x + .... + 101x = 31200
(3 + 5 + 7 + .... + 101) . x = 31200
Áp dụng công thức tính dãy số ta có :
3 + 5 + 7 +..... + 101 = 2600
=> 2600x = 31200
=> x = 31200 : 2600
=> x = 12
X x 3 + X x 5 + X x 7 + ... + X x 101 = 31200
X x ( 3 + 5 + 7 + ... + 101 ) = 31200
X x 2600 = 31200
X = 31200 : 2600
X = 12
Dễ hiểu rồi đó
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\(\frac{x+2019}{x+2018}=\frac{4038}{4037}\)
\(\Rightarrow\left(x+2019\right)4037=\left(x+2018\right)4038\)
\(\Rightarrow4037x+\left(4037\times2019\right)=4038x+\left(4038\times2018\right)\)
\(\Rightarrow4037x+8150703=4038x+8148684\)
\(\Rightarrow4037x-4038x=-8150703+8148684\)
\(\Rightarrow-x=-2019\)
\(\Rightarrow x=2019\)
P/s: Số to kinh -_- Ko chắc đúng đâu.
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7,2 : 2 x 46,5 + 1,55 x 3 x 64
= 3,6 x 46,5 + 4,65 x 64
= 3,6 x ( 4,65 x 10 ) + 4,65 x 64
= 3,6 x 4,65 x 10 + 4,65 x 64
= ( 3,6 x 10 ) x 4,65 + 4,65 x 64
= 36 x 4,65 + 4,65 x 64
= ( 36 + 64 ) x 4,65
= 100 x 4,65
= 465
Nếu mình đúng thì k mình các bạn nhé
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(x+1/2)+(x+1/4)+(x+1/8)+(x+1/16)=1
<=>(x+x+x+x)+(1/2+1/4+1/8+1/16)=1
<=>4x+15/16=1
=>4x=1-15/16=1/16
=>x=1/16:4
=>x=1/64
x + 3,7.x + x.5,3 = 2018
x.( 1 + 3,7 + 5,3 ) = 2018
x . 10 = 2018
x = 201,8
x+3,7.x+x.5,3=2018
x( 1+3,7+5,3) =2018
x. 10 =2018
x =2018:10
x =201,8
Vậy x = 201,8
Hok tốt nha bn