Question

(1/4+3/4х):0,45=25/36

Answer 1

$frac{1+3x}{4} * frac{100}{45} = frac{25}{36}$
1+3x*$frac{25}{45} = [tex] frac{25}{36}$
1+3x*$frac{5}{9} = frac{25}{36}$
$frac{5+15x}{9 } = frac{25}{36}$
225=180+540x
45=540x
x=$frac{1}{12}$

Answer 2

 frac{100}{45} frac{1}{4} +3/4х)=25/36
100*1 / 45*4  +  100*3 / 45*4х=25/36
25/45+75/15х=25/36
75/15х=-25/45+25/36
75/15х=-100/180 + 125/180
75/15х= frac{25}{180} 
х=frac{25}{180}   /    frac{75}{15} 
дальше сам