Question

Решити уравнения:
1.3x+3.8x+0.03=2.01

Answer 1

1.3x+3.8x=-0.03+2.01
5.1x-1.98
x=1.98/5.1
x=0.3

Answer 2

1.3x+3.8x+0.03=2.01
$1 \frac{3}{10} x+3 \frac{8}{10} x+ \frac{3}{100} = 2 \frac{1}{100}$
$\frac{13}{10} x+ \frac{38}{10} x+ \frac{3}{100} = \frac{201}{100}$
$\frac{13+38}{10} x= \frac{201}{100} - \frac{3}{100}$
$\frac{51}{10} x= \frac{198}{100}$
$x= \frac{198}{100} : \frac{51}{10}$
$x= \frac{198}{100} * \frac{10}{51} = \frac{198*10}{100*51}$
$x= \frac{1980}{5100} = \frac{198}{510} = \frac{33}{85}$
$x= \frac{33}{85}$
$1 \frac{3}{10} * \frac{33}{85}+3 \frac{8}{10} *\frac{33}{85}+ \frac{3}{100} = 2 \frac{1}{100}$
$2 \frac{1}{100}=2 \frac{1}{100}$
2,01=2,01