Question

mă ajutați?dau coroniță!​

Answer 1

1. b){8+66:[100-(80:4+45:5)-5]}×28

={8+66:[100-(20+9)-5]}×28

=[8+66:(100-29-5)]×28

=(8+66:66)×28

=9×28

=252

2.[45:(34-a)+44]:7=7

45:(34-a)+44=49

45:(34-a)=5

34-a=9

a=34-9

a=25

3.

x+(x+1)+(x+2)=90

3x+3=90

3x=87

x=87:3

x=29 primul număr

29+(29+1)+(29+2)=29+30+31=59+31=90

4.a+b=250

a:b=6

a=250-b

_______

a+b=250

=>250-b+b=250

=>2b=0

=>b=0

a+b=250

a+0=250

a=250

5.

24=6-4×a

30+4=a

34=a

a=34