Question

determinati numerele necunoscute din exercitiile de mai jos​

Answer 1

Răspuns:

c 27=10x-35

10x=62

x=6,2

d 15x+20=77

15x=57

x=3,8

e 15x+3=8

15x=5

x=0,(3)

Answer 2

$\frac{3}{5}=\frac{2x-7}{9} => (2x-7)*5=3*9 => 10x-35=27\\10x=27+35 => 10x=62 => x=\frac{62}{10} \\\\\frac{3x+4}{7}=\frac{11}{5} => (3x+4)*5=11*7 => 15x+20=77\\15x=77-20 => 15x=57 => x=\frac{57}{15} \\\\\frac{5x+1}{2}=\frac{4}{3} => (5x+1)*3=2*4 =>15x+3=8\\15x=8-3 => 15x=5 => x=\frac{5}{15} => x=\frac{1}{3}$