Question

1)Calculati:
a)20: (225 : 9-65 :13)=
b)17x (57:3-84:12)=
c)243 : [61+80:(31-54:2)]=
d)[(21x7+53x5) : 4-53]:10=
e)65:{8-75:[(52:13+9)x2-1]}=
f){[7+51:(72:12+11)]x6-4}:4=
ajutorrr am nevoie urgent!!!

Answer 1

a)20: (225 : 9-65 :13)=
20:(25-5)=20:20=1
b)17x (57:3-84:12)=
17·(19-7)=17·12=204
c)243 : [61+80:(31-54:2)]=
243:[61+80:(31-27)]=
243:[61+80:4)]=
243:(61+20)=
243:81=3
d)[(21x7+53x5) : 4-53]:10=
[147+265):4-53]:10=
(412:4-53):10=
(103-53):10=
50:10=5
e)65:{8-75:[(52:13+9)x2-1]}=
65:{8-75:[(4+9)·2-1]}=
65:{8-75:(13·2-1)}=
65:[8-75:(26-1)]=
65:(8-75:25)=
65:(8-3)=
65:5=13
f){[7+51:(72:12+11)]x6-4}:4=
{[7+51:(6+11)]·6-4}:4=
{[(7+51:17)]·6-4}:4=
[(7+3)·6-4]:4=
(10·6-4):4=
(60-4):4=
56:4=14