Răspuns:
Explicație pas cu pas:
a) 30: 1/10 x (1-1/3)=
= 30 x 10 x ( 1 x3/3 -1/3)=
= 300x (3/3-1/3)=
=300 x 2/3= 100x2=200
b) 3: ( 2/6/9 +3) x 1/4=
= 3:( 2:6/9 +3) x1/4=
= 3 :( 2 x 9/6 +3) x1/4=
= 3 : ( 3+3) x 1/4=
= 3 :6 x1/4=
= 3/6x1/4=
=1/2 x1/4= 1/8
c) 3/4 x ( 8/9 -1/6) :5/4=
= 3/4 x ( 8 ori 2/18 - 1 ori 3/18) x 4/5=
= 3/4 x ( 16/18- 3/18) x 4/5=
= 3/4 x 13/18 x4/5=
= 13/ 24 x 4/5= 13/30
d) 1/4 x ( 15/10 +3/9 : 2)=
=1/4 x ( 3/2 + 3/9 x2)=
= 1/4 x (3/2+ 6/9)=
= 1/4 x ( 3 ori 9/28+ 6 ori 2/18)=
= 1/4 x (27/18 + 12/18)=
= 1/4x 39/18== 39/72
f) [35/10 + ( 5 + 1/6) - 4x3+1/3] : 3x3+2/3 x2/5=
= [35/10 + ( 5x6/6+1/6)-13/3] :11/3 x 2/5=
= [35/10 + (30/6-1/6) -13/3] : 11/3 x2/5=
= ( 35/10+ 29/6-13/3) x 3/11 x 2/5=
= (35 x3/30 + 29x5/30 - 13 x10/30) x 6/55=
= (105/30+ 145/30 -130/30) x 6/55=
= 120/30 x6/55=
= 12/3 x6/55=
= 4x6/55= 24/55
