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Ta có : x . x/5 . 7,5 + x/2 . 9 = 315
=> x . ( x/5 . 7,5 ) + 9x/2 = 315
=> x . ( 7,5x / 5 ) + 4,5 . x = 315
=> x . 1 , 5 . x + 4,5 . x = 315
=> 1 , 5 . x ( x + 3 ) = 315
=> x.( x + 3 ) = 315 : 1,5
=> x . ( x + 3 ) = 210
=> x = 13 ( dư 2 )
a)13x3x32,27+67,63x39
=39x32,27+67,63x39
=39x(32,27+67,63)
=39x100
=3900
b,= 1- [ 1/2 x 1/3 x1/4 x..... x 1/100 ]
=1/2 x 2/3 x 3/4 x .......x 99/100
= 1x2x3x......x99 / 2x3x4x...... x100 [ rút gọn ]
= 1/100
a, 6/9+5/7+1/3=2/3+5/7+1/3=5/7+1=12/7
b, 17/7+6/5-20/14=17/7+6/5-10/7=6/5+1=11/5
c,2/5x1/4+3/4x2/5=2/5x(1/4+3/4)=2/5x1=2/5
d, 6/11:4/6+5/11:2/3=6/11:2/3+5/11:2/3=(6/11+5/11):2/3=3/2
nha
X x\(\frac{1}{2}\)+ X x\(\frac{3}{4}\)=\(\frac{6}{7}\)
=>X x(\(\frac{1}{2}\)+ \(\frac{3}{4}\)) =\(\frac{6}{7}\)
=>X x \(\frac{5}{4}\)=\(\frac{6}{7}\)
=>X=\(\frac{6}{7}\): \(\frac{5}{4}\)
=>X=\(\frac{24}{35}\)
=> x . 10 + x . 5 = 24
=> x . ( 10 + 5 ) = 24
=> x . 15 = 24
=> x = 24 : 15
=> x = 1,6
Tk mk nha
\(x:0,1+x.5=24\)
\(x:\frac{1}{10}+x\cdot5=24\)
\(x\cdot10+x\cdot5=24\)
\(x\cdot\left(10+5\right)=24\)
\(x\cdot15=24\)
\(x=\frac{24}{15}\)
a) PT \(\Leftrightarrow x=\dfrac{6}{0,12}=50\)
Vậy \(x=50\)
b) PT \(\Leftrightarrow x=4\cdot2,5=10\)
Vậy \(x=10\)
c) PT \(\Leftrightarrow x=\dfrac{5,6}{4}=1,4\)
Vậy \(x=1,4\)
d) \(\Leftrightarrow x=\dfrac{\dfrac{2}{5}}{0,1}=4\)
Vậy \(x=4\)
a) \(0,12\times x=6\)
\(x=\dfrac{6}{0,12}\)
\(x=50\).