Question

Решите уравнения:1)1,2*(3x+5)=2*(2,4x-3,6).2)6,72-3*(4,1x-2,8)=9,5x+189,52. 3)1,86 +(13,33-x):2,7=5,16

Answer 1

$1,2*(3x+5)=2*(2,4x-3,6)$
$3.6x+6=4.8x-7.2$
$3.6x-4.8x=-6-7.2$
$-1.2x=-13.2$
$x=11$

$6,72-3*(4,1x-2,8)=9,5x+189,52$
$6.72-12.3x+8.4=9.5x+189.52$
$-12.3x-9.5x=-6.72-8.4+189.52$
$-21.8x=174.4$
$x=-8$

$1,86 +(13,33-x):2,7=5,16$        $|*2.7$
$5.022+13,33-x=13.932$
$-x=-4.42$
$x=4.42$