Question

( x -7 ) · 5 = 0
( 3/7 y - 9/14 ) · 0,4 = 0
решить плс

Answer 1

$(x-7)*5=0; \\ x-7=0 \\ x=7$


$( \frac{3}{7} y - \frac{9}{14} ) * \frac{4}{10} = 0 \\ \frac{3}{7} y - \frac{9}{14} =0 \\ \frac{3}{7} y = \frac{9}{14} \\ y= \frac{9}{14} : \frac{3}{7} =\frac{9}{14} * \frac{7}{3} = 1.5$

Answer 2

( x-7)*5=0
x-7=0*7
x-7=0
x=7+0
x=7

(3/7y-9/14)*0,4=0
3/7y-9/14=0*0,4
3/7y-9/14=0
3/7y=0+9/14
3/7y=9/14
y=9/14:3/7=9/14*7/3
y=1,2