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X : 0,1 - 9,9 = X x 0,1 + 9,9
X x 10 - 9,9 = X x 0,1 + 9,9
10X - 9,9 = 0,1X + 9,9
10X - 0,1X = 9,9 +9,9
9,9X = 19,8
X = 19,8 : 9,9
X = 2
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(0.1+1.2+2.3+3.4+4.5+5.6+6.7+7.8+8.9):x=13.5
40.5:x=13.5
x=40.5:13.5
x=3
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=(x+x+x+........+x)+(0.1+0.2+0.3+.........+4.9)=44.2
/ có 49x hay 50x nhe tự xem đi /
44.2 - ((4.9+0.1). k/c :2)=(x+x+x+..........+x)=?
lấy ? : (cái trong //)= x
can you k me
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a ) \(x\times3,9+x\times0,1=2,7\)
\(x\times\left(3,9+0,1\right)=x\times4=2,7\)
x = 2,7 : 4 = 0,675
b ) \(\frac{12,3}{x}-\frac{4,5}{x}=15=\frac{7,8}{x}\)
\(=7,8\div x=15\)
\(x=15\div7,8=\frac{15}{7,8}\)
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a/ (x+0.2)+(x+0,7)+(x+1,2)+.........+(x+4,7)=147,3
\(\left(x+x+x+...+x\right)+\left(0,2+0,7+1,2+...+4,7\right)=147,3\)
\(10x+24,5=147,3\)
\(10x=122,8\)
\(x=12,28\)
b/(x+0.1)+(x+0,3)+(x+0,5)+.........+(x+1.9)=120
\(\left(x+x+x+...+x\right)+\left(0,1+0,3+0,5+...+1,9\right)=120\)
\(10x+10=120\)
\(10x=110\)
\(x=11\)
a ) ( x + 0,2 ) + ( x + 0,7 ) + ( x + 1,2 ) + ... + ( x + 4,7 ) = 147,3
( x + x + x + ... + x ) + ( 0,2 + 0,7 + 1,2 + ... + 4,7 ) = 147,3
10x + 24,5 = 147,3
10x = 147,3 - 24,5
10x = 122,8
= > x = 122,8 : 10 = 12,28
b ) ( x + 0,1 ) + ( x + 0,3 ) + ( x + 0,5 ) + ... + ( x + 1,9 ) = 120
( x + x + x + ... x ) + ( 0,1 + 0,3 + 0,5 + ... + 1,9 ) = 120
10x + 10 = 120
10x = 120 - 10
10x = 110
= > x = 110 : 10 = 11
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