Question

efectuați: a)75/27÷[2/9+1/28÷(1/7-1/8)]-1/4 ​

Answer 1

Răspuns:

Explicație pas cu pas:

75/27:[2/9+1/28:(1/7-1/8)]-1/4 (amplific 1/7 cu 8 și 1/8 cu 7)

=>75/27:[2/9+1/28:(8-7/56)]-1/4

=>75/27:(2/9+1/28:1/56)-1/4

=>75/27:(2/9+1/28·56)-1/4

=>75/27:(2/9+2)-1/4 (amplificam 2 cu 9)

=>75/27:(2+18/9)-1/4

=>75/27:20/9-1/4

=>75/27·9/20-1/4

=15/3·1/4-1/4

=5·1/4-1/4

=5/4-1/4

=4/4

=1