17,58x43+57x17,58=17,58x(43+57)=17,58x100=1758
43,57x2,6x(630-315x2)=43,57x2,6x0=0
$\frac{45x16-17}{45x15+28}$=$\frac{703}{703}$ =1
Tìm x
X/2+3/4=6/7
<=>(14 x X)/28+(3x7)/28=(6x4)/28
<=>14 x X+21=24
<=>14 x X=3
<=>X=3/14
33,3:(X-3,5)+45,7=799
<=>33,3:(X-3,5)=799-45,7=753,3
<=>X-3,5=753,3/33,3=22,62
<=>X=26,12
(X-1)+(X-2)+(X-3)+(X-4)=30
<=>X-1+X-2+X-3+X-4=30
<=>4 x X + 10=30
<=>4 x X=40
<=>X=10