Question

Решите уравнения:
А) $frac{x}{30} - frac{x}{40} = frac{3}{4}$
Б) $5* frac{9}{11} x+3*x=234$

Answer 1

$А) frac{x}{30}- frac{x}{40}= frac{3}{4} \ frac{4x-3x}{120}= frac{90}{120} \ x=90$
$5* frac{9}{11}x+3x=234 \ frac{45}{11} x+3x=243 \ frac{78}{11} x=234 \ x=234* frac{11}{78} \ x=33$

Answer 2

x/30-x/40=3/4
4x-3x/120=90/120 l *120
x=90